| |
Main
Date: 17 Jul 2007 10:43:51
From: almost_fast@yahoo.com
Subject: Who would use a 60 tooth chainring?
|
Saw this:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241
... and while it looks like a nice polished finish, I wonder who would
legitimately need such a big ring?
|
|
| |
Date: 20 Jul 2007 17:25:58
From: NickP
Subject: Re: Who would use a 60 tooth chainring?
|
Anything with small wheels - eg Birdy, Bike Friday, etc.
Tandems with normal size wheels.
<almost_fast@yahoo.com > wrote in message
news:1184694231.425998.271100@d30g2000prg.googlegroups.com...
> Saw this:
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241
>
> ... and while it looks like a nice polished finish, I wonder who would
> legitimately need such a big ring?
>
|
| |
Date: 19 Jul 2007 22:26:34
From: JeffWills
Subject: Re: Who would use a 60 tooth chainring?
|
On Jul 19, 3:03 am, Johnny Sunset aka Tom Sherman
<sunsetss0...@yahoo.com > wrote:
>
> > A friend of mine uses a 60 x 11 gear with a 700C wheel for time
> > trialing. His best is 16:42 for 10 miles. He does have a considerable
> > aero advantage, though:
> >http://photostore.chrisleck.com/gallery/2927606#157886640-M-LB
>
> Varna based "Moby"?
>
Close- it's a "Vester": the shell originally came from the Varna molds
before being extensively modified. Underneath, it's a modified
Challenge Jester lowracer.
Similarly, Lonnie Morse's machine is a modified Varna shell on a
Zephyr lowracer:
http://photostore.chrisleck.com/gallery/2927606#157886820-M-LB
Jeff
|
| |
Date: 19 Jul 2007 13:59:35
From: Ozark Bicycle
Subject: Re: Who would use a 60 tooth chainring?
|
On Jul 18, 7:39 pm, Johnny Sunset aka Tom Sherman
<sunsetss0...@yahoo.com > wrote:
> Paul Myron Hobson wrote:
>
> >> On Jul 17, 12:43 pm, "almost_f...@yahoo.com" <almost_f...@yahoo.com>
> >> wrote:
> >>> Saw this:http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241
>
> >>> ... and while it looks like a nice polished finish, I wonder who would
> >>> legitimately need such a big ring?
>
> > Ozark Bicycle wrote:
> >> This guy uses one every week on his "club ride":
>
> >>http://tinyurl.com/38uysz
>
> > Ctrl-f "bicycle" - NOT FOUND!
>
> > What does that link have to do with this? Is it the wrong TinyURL?
>
> Walter Mitty is a cultural reference. Reading the introduction to the
> Wikipedia article should make it clear why "Ozark Bicycle" posted the link.
>
Thank you for acting as cultural liaison, Thomas. :-)
|
| |
Date: 19 Jul 2007 11:29:18
From: zencycle
Subject: Re: Who would use a 60 tooth chainring?
|
On Jul 18, 10:35 pm, still me <wheeled...@yahoo.com > wrote:
> On Wed, 18 Jul 2007 19:39:18 -0500, Johnny Sunset aka Tom Sherman
>
> <sunsetss0...@yahoo.com> wrote:
> >Walter Mitty is a cultural reference. Reading the introduction to the
> >Wikipedia article should make it clear why "Ozark Bicycle" posted the link.
>
> "I should wear the clothing, of Sir Walter Mitty. See my tailor he's
> called Simon, I know it's going to fit"... Ian Dorry.
That would be Ian Dury, not Dorry. the song referenced is "Sex and
Drugs and Rock and Roll" by Ian Dury and The Blockheads
|
| | |
Date: 19 Jul 2007 23:42:09
From: still me
Subject: Re: Who would use a 60 tooth chainring?
|
On Thu, 19 Jul 2007 11:29:18 -0700, zencycle <zencycle@bikerider.com >
wrote:
>
>That would be Ian Dury, not Dorry. the song referenced is "Sex and
>Drugs and Rock and Roll" by Ian Dury and The Blockheads
Thank you zen master, I sit corrected.
|
| | |
Date: 19 Jul 2007 16:13:37
From: * * Chas
Subject: Re: Who would use a 60 tooth chainring?
|
"zencycle" <zencycle@bikerider.com > wrote in message
news:1184869758.820166.160720@m3g2000hsh.googlegroups.com...
> On Jul 18, 10:35 pm, still me <wheeled...@yahoo.com> wrote:
> > On Wed, 18 Jul 2007 19:39:18 -0500, Johnny Sunset aka Tom Sherman
> >
> > <sunsetss0...@yahoo.com> wrote:
> > >Walter Mitty is a cultural reference. Reading the introduction to the
> > >Wikipedia article should make it clear why "Ozark Bicycle" posted the
link.
> >
> > "I should wear the clothing, of Sir Walter Mitty. See my tailor he's
> > called Simon, I know it's going to fit"... Ian Dorry.
>
> That would be Ian Dury, not Dorry. the song referenced is "Sex and
> Drugs and Rock and Roll" by Ian Dury and The Blockheads
>
I always thought that The Pogues did that on their album "Rum, Sodomy, &
the Lash".....
Chas.
|
| |
Date: 19 Jul 2007 11:22:05
From: zencycle
Subject: Re: Who would use a 60 tooth chainring?
|
On Jul 18, 10:35 pm, still me <wheeled...@yahoo.com > wrote:
> On Wed, 18 Jul 2007 19:39:18 -0500, Johnny Sunset aka Tom Sherman
>
> <sunsetss0...@yahoo.com> wrote:
> >Walter Mitty is a cultural reference. Reading the introduction to the
> >Wikipedia article should make it clear why "Ozark Bicycle" posted the link.
>
> "I should wear the clothing, of Sir Walter Mitty. See my tailor he's
> called Simon, I know it's going to fit"... Ian Dorry.
That would Ian Dury, not dorry, The song referenced is "Sex and Drugs
and Rock and Roll" by Ian Dury and The Blockheads
|
| |
Date: 19 Jul 2007 01:38:45
From:
Subject: Re: Who would use a 60 tooth chainring?
|
There is a guy who tt's round here who uses a 77 tooth chainring.
http://www.sarahbrookephotography.co.uk/photo386479.html
Nick
|
| | |
Date: 19 Jul 2007 19:21:18
From: Michael Press
Subject: Re: Who would use a 60 tooth chainring?
|
In article
<1184834325.561074.81860@g12g2000prg.googlegroups.com >,
nce21@hotmail.com wrote:
> There is a guy who tt's round here who uses a 77 tooth chainring.
> http://www.sarahbrookephotography.co.uk/photo386479.html
I am odd. I cannot enjoy a picture with a big ole
rubber stamp on it.
--
Michael Press
|
| | | |
Date: 19 Jul 2007 15:00:58
From: Bill Sornson
Subject: Re: Who would use a 60 tooth chainring?
|
Michael Press wrote:
> I am odd.
In other breaking news...
Bill "fun with snips" S.
|
| | |
Date: 19 Jul 2007 12:01:30
From: still me
Subject: Re: Who would use a 60 tooth chainring?
|
On Thu, 19 Jul 2007 01:38:45 -0700, nce21@hotmail.com wrote:
>There is a guy who tt's round here who uses a 77 tooth chainring.
>http://www.sarahbrookephotography.co.uk/photo386479.html
>Nick
Oh sure, but he's probably got an 11-52 in back!
|
| |
Date: 18 Jul 2007 22:26:33
From: JeffWills
Subject: Re: Who would use a 60 tooth chainring?
|
On Jul 17, 9:59 am, dvt <dvt+use...@psu.edu > wrote:
> almost_f...@yahoo.com wrote:
> > Saw this:
> >http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241
>
> > .... and while it looks like a nice polished finish, I wonder who would
> > legitimately need such a big ring?
>
> Bikes with small wheels (folding bikes, 'bents).
>
A friend of mine uses a 60 x 11 gear with a 700C wheel for time
trialing. His best is 16:42 for 10 miles. He does have a considerable
aero advantage, though:
http://photostore.chrisleck.com/gallery/2927606#157886640-M-LB
Jeff
|
| | |
Date: 19 Jul 2007 06:03:01
From: Johnny Sunset aka Tom Sherman
Subject: Re: Who would use a 60 tooth chainring?
|
Jeff Wills wrote:
> On Jul 17, 9:59 am, dvt <dvt+use...@psu.edu> wrote:
>> almost_f...@yahoo.com wrote:
>>> Saw this:
>>> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241
>>> .... and while it looks like a nice polished finish, I wonder who would
>>> legitimately need such a big ring?
>> Bikes with small wheels (folding bikes, 'bents).
>>
>
> A friend of mine uses a 60 x 11 gear with a 700C wheel for time
> trialing. His best is 16:42 for 10 miles. He does have a considerable
> aero advantage, though:
> http://photostore.chrisleck.com/gallery/2927606#157886640-M-LB
Varna based "Moby"?
--
Tom Sherman - Holstein-Friesland Bovinia
The weather is here, wish you were beautiful
--
Posted via a free Usenet account from http://www.teranews.com
|
| |
Date: 18 Jul 2007 19:46:14
From: Johnny Sunset aka Tom Sherman
Subject: Re: Who would use a 60 tooth chainring?
|
almost_fast@yahoo.com who? wrote:
> Saw this:
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241
>
> ... and while it looks like a nice polished finish, I wonder who would
> legitimately need such a big ring?
The 62/11 on my RANS Rocket is 110 gear inches (with 44-406 rear tire),
or about the same as a 50/12 on a bicycle with 25-622 (700C) tires.
A 60-tooth large chainring would be a reasonable choice for a Bike
Friday with ISO 451-mm wheels.
--
Tom Sherman - Holstein-Friesland Bovinia
The weather is here, wish you were beautiful
--
Posted via a free Usenet account from http://www.teranews.com
|
| |
Date: 18 Jul 2007 14:51:49
From: Ozark Bicycle
Subject: Re: Who would use a 60 tooth chainring?
|
On Jul 17, 12:43 pm, "almost_f...@yahoo.com" <almost_f...@yahoo.com >
wrote:
> Saw this:http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241
>
> ... and while it looks like a nice polished finish, I wonder who would
> legitimately need such a big ring?
This guy uses one every week on his "club ride":
http://tinyurl.com/38uysz
|
| | |
Date: 18 Jul 2007 17:59:26
From: Paul Myron Hobson
Subject: Re: Who would use a 60 tooth chainring?
|
> On Jul 17, 12:43 pm, "almost_f...@yahoo.com" <almost_f...@yahoo.com>
> wrote:
>> Saw this:http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241
>>
>> ... and while it looks like a nice polished finish, I wonder who would
>> legitimately need such a big ring?
Ozark Bicycle wrote:
> This guy uses one every week on his "club ride":
>
> http://tinyurl.com/38uysz
>
>
Ctrl-f "bicycle" - NOT FOUND!
What does that link have to do with this? Is it the wrong TinyURL?
\\paul
|
| | | |
Date: 18 Jul 2007 19:39:18
From: Johnny Sunset aka Tom Sherman
Subject: Re: Who would use a 60 tooth chainring?
|
Paul Myron Hobson wrote:
>
>> On Jul 17, 12:43 pm, "almost_f...@yahoo.com" <almost_f...@yahoo.com>
>> wrote:
>>> Saw this:http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241
>>>
>>> ... and while it looks like a nice polished finish, I wonder who would
>>> legitimately need such a big ring?
>
> Ozark Bicycle wrote:
>> This guy uses one every week on his "club ride":
>>
>> http://tinyurl.com/38uysz
>>
>>
>
> Ctrl-f "bicycle" - NOT FOUND!
>
> What does that link have to do with this? Is it the wrong TinyURL?
Walter Mitty is a cultural reference. Reading the introduction to the
Wikipedia article should make it clear why "Ozark Bicycle" posted the link.
--
Tom Sherman - Holstein-Friesland Bovinia
The weather is here, wish you were beautiful
--
Posted via a free Usenet account from http://www.teranews.com
|
| | | | |
Date: 18 Jul 2007 23:52:53
From: Paul Myron Hobson
Subject: Re: Who would use a 60 tooth chainring?
|
Johnny Sunset aka Tom Sherman wrote:
> Paul Myron Hobson wrote:
>>
>>> On Jul 17, 12:43 pm, "almost_f...@yahoo.com" <almost_f...@yahoo.com>
>>> wrote:
>>>> Saw
>>>> this:http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241
>>>>
>>>> ... and while it looks like a nice polished finish, I wonder who would
>>>> legitimately need such a big ring?
>>
>> Ozark Bicycle wrote:
>>> This guy uses one every week on his "club ride":
>>>
>>> http://tinyurl.com/38uysz
>>>
>>>
>>
>> Ctrl-f "bicycle" - NOT FOUND!
>>
>> What does that link have to do with this? Is it the wrong TinyURL?
>
> Walter Mitty is a cultural reference. Reading the introduction to the
> Wikipedia article should make it clear why "Ozark Bicycle" posted the link.
>
Ahh yes.
[forehead slap]
|
| | | | |
Date: 19 Jul 2007 02:35:07
From: still me
Subject: Re: Who would use a 60 tooth chainring?
|
On Wed, 18 Jul 2007 19:39:18 -0500, Johnny Sunset aka Tom Sherman
<sunsetss0003@yahoo.com > wrote:
>Walter Mitty is a cultural reference. Reading the introduction to the
>Wikipedia article should make it clear why "Ozark Bicycle" posted the link.
"I should wear the clothing, of Sir Walter Mitty. See my tailor he's
called Simon, I know it's going to fit"... Ian Dorry.
|
| |
Date: 18 Jul 2007 14:24:02
From: bfd
Subject: Re: Who would use a 60 tooth chainring?
|
On Jul 17, 10:43 am, "almost_f...@yahoo.com" <almost_f...@yahoo.com >
wrote:
> Saw this:http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241
>
> ... and while it looks like a nice polished finish, I wonder who would
> legitimately need such a big ring?
Some who ride small folding bikes with 16 or 20" wheels use chainrings
as large as 60t. Check out Dahon or Brompton for more info.
|
| |
Date: 17 Jul 2007 19:31:34
From: John Forrest Tomlinson
Subject: Re: Who would use a 60 tooth chainring?
|
On Tue, 17 Jul 2007 10:43:51 -0700, "almost_fast@yahoo.com"
<almost_fast@yahoo.com > wrote:
>Saw this:
>http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241
>
>... and while it looks like a nice polished finish, I wonder who would
>legitimately need such a big ring?
Some riding a bike with small wheels.
--
JT
****************************
Remove "remove" to reply
Visit http://www.jt10000.com
****************************
|
| | |
Date: 18 Jul 2007 02:29:33
From: still me
Subject: Re: Who would use a 60 tooth chainring?
|
On Tue, 17 Jul 2007 19:31:34 -0400, John Forrest Tomlinson
<usenetremove@jt10000.com > wrote:
>>... and while it looks like a nice polished finish, I wonder who would
>>legitimately need such a big ring?
>
>Some riding a bike with small wheels.
You mean like a Shriner ?
|
| |
Date: 17 Jul 2007 21:03:52
From: Zog The Undeniable
Subject: Re: Who would use a 60 tooth chainring?
|
almost_fast@yahoo.com wrote:
> Saw this:
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241
>
> ... and while it looks like a nice polished finish, I wonder who would
> legitimately need such a big ring?
>
Time triallists.
A local guy wins 10s and 25s on a 125" fixed gear. That's 60 x 13. On
fixed you can't have a smaller sprocket, so the chainring has to be bigger.
|
| | |
Date: 17 Jul 2007 21:18:27
From: Kinky Cowboy
Subject: Re: Who would use a 60 tooth chainring?
|
On Tue, 17 Jul 2007 21:03:52 +0100, Zog The Undeniable
<hrothgar19@yahoo.com > wrote:
>almost_fast@yahoo.com wrote:
>> Saw this:
>> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241
>>
>> ... and while it looks like a nice polished finish, I wonder who would
>> legitimately need such a big ring?
>>
>Time triallists.
>
>A local guy wins 10s and 25s on a 125" fixed gear. That's 60 x 13. On
>fixed you can't have a smaller sprocket, so the chainring has to be bigger.
And some people just get on with big gears; a fellow fixed gear
pervert did 2:13 for the 50 on Sunday on 60x14, as compared with my
2:21 on 50x15. There is also a small gain in transmission efficiency
from using a big ring, maybe as much as 4W by switching from 48x12 to
60x15 for a rider making 500W
Kinky Cowboy*
*Batteries not included
May contain traces of nuts
Your milage may vary
|
| | | |
Date: 17 Jul 2007 18:26:23
From: Paul Myron Hobson
Subject: Re: Who would use a 60 tooth chainring?
|
Kinky Cowboy wrote:
> On Tue, 17 Jul 2007 21:03:52 +0100, Zog The Undeniable
> <hrothgar19@yahoo.com> wrote:
>
>> almost_fast@yahoo.com wrote:
>>> Saw this:
>>> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241
>>>
>>> ... and while it looks like a nice polished finish, I wonder who would
>>> legitimately need such a big ring?
>>>
>> Time triallists.
>>
>> A local guy wins 10s and 25s on a 125" fixed gear. That's 60 x 13. On
>> fixed you can't have a smaller sprocket, so the chainring has to be bigger.
>
> And some people just get on with big gears; a fellow fixed gear
> pervert did 2:13 for the 50 on Sunday on 60x14, as compared with my
> 2:21 on 50x15. There is also a small gain in transmission efficiency
> from using a big ring, maybe as much as 4W by switching from 48x12 to
> 60x15 for a rider making 500W
Excellent point. I'd also be concerned about the strength of a 12T cog
when dealing with a rider that strong.
\\paul
|
| | | | |
Date: 18 Jul 2007 18:01:31
From: Kinky Cowboy
Subject: Re: Who would use a 60 tooth chainring?
|
On Tue, 17 Jul 2007 18:26:23 -0400, Paul Myron Hobson
<phobson@gatech.edu > wrote:
>Kinky Cowboy wrote:
>> On Tue, 17 Jul 2007 21:03:52 +0100, Zog The Undeniable
>> <hrothgar19@yahoo.com> wrote:
>>
>>> almost_fast@yahoo.com wrote:
>>>> Saw this:
>>>> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241
>>>>
>>>> ... and while it looks like a nice polished finish, I wonder who would
>>>> legitimately need such a big ring?
>>>>
>>> Time triallists.
>>>
>>> A local guy wins 10s and 25s on a 125" fixed gear. That's 60 x 13. On
>>> fixed you can't have a smaller sprocket, so the chainring has to be bigger.
>>
>> There is also a small gain in transmission efficiency
>> from using a big ring, maybe as much as 4W by switching from 48x12 to
>> 60x15 for a rider making 500W
>
>Excellent point. I'd also be concerned about the strength of a 12T cog
>when dealing with a rider that strong.
>
I wouldn't worry too much; Chris Hoy used a 13 for his kilo record
attempt, and no 500W pursuiter/time triallist is going to hit the cog
harder than that. Boonen sometimes engages the 11, with it's shortened
and ramped teeth, and you don't hear of him breaking sprockets either.
Kinky Cowboy*
*Batteries not included
May contain traces of nuts
Your milage may vary
|
| | | | | |
Date: 18 Jul 2007 17:45:20
From: Paul Myron Hobson
Subject: Re: Who would use a 60 tooth chainring?
|
>> Kinky Cowboy wrote:
>>>> A local guy wins 10s and 25s on a 125" fixed gear. That's 60 x 13. On
>>>> fixed you can't have a smaller sprocket, so the chainring has to be bigger.
>>> There is also a small gain in transmission efficiency
>>> from using a big ring, maybe as much as 4W by switching from 48x12 to
>>> 60x15 for a rider making 500W
> On Tue, 17 Jul 2007 18:26:23 -0400, Paul Myron Hobson
>> Excellent point. I'd also be concerned about the strength of a 12T cog
>> when dealing with a rider that strong.
Kinky Cowboy wrote:
> I wouldn't worry too much; Chris Hoy used a 13 for his kilo record
> attempt, and no 500W pursuiter/time triallist is going to hit the cog
> harder than that. Boonen sometimes engages the 11, with it's shortened
> and ramped teeth, and you don't hear of him breaking sprockets either.
Duly noted. But now I'm curious: how many miles do you think his cogs
saw? An elite time trial rider with top shelf stuff would surely have a
different experience than say a commuter putting daily miles on one.
Or am I still being paranoid?
|
| | | | | | |
Date: 18 Jul 2007 18:08:44
From: John Forrest Tomlinson
Subject: Re: Who would use a 60 tooth chainring?
|
On Wed, 18 Jul 2007 17:45:20 -0400, Paul Myron Hobson
<phobson@gatech.edu > wrote:
>>> Kinky Cowboy wrote:
>>>>> A local guy wins 10s and 25s on a 125" fixed gear. That's 60 x 13. On
>>>>> fixed you can't have a smaller sprocket, so the chainring has to be bigger.
>>>> There is also a small gain in transmission efficiency
>>>> from using a big ring, maybe as much as 4W by switching from 48x12 to
>>>> 60x15 for a rider making 500W
>
>
>> On Tue, 17 Jul 2007 18:26:23 -0400, Paul Myron Hobson
>>> Excellent point. I'd also be concerned about the strength of a 12T cog
>>> when dealing with a rider that strong.
>
>Kinky Cowboy wrote:
>> I wouldn't worry too much; Chris Hoy used a 13 for his kilo record
>> attempt, and no 500W pursuiter/time triallist is going to hit the cog
>> harder than that. Boonen sometimes engages the 11, with it's shortened
>> and ramped teeth, and you don't hear of him breaking sprockets either.
>
>Duly noted. But now I'm curious: how many miles do you think his cogs
>saw? An elite time trial rider with top shelf stuff would surely have a
> different experience than say a commuter putting daily miles on one.
>Or am I still being paranoid?
Have you ever seen the problem you fear?
--
JT
****************************
Remove "remove" to reply
Visit http://www.jt10000.com
****************************
|
| | | | | | | |
Date: 18 Jul 2007 18:24:14
From: Paul Myron Hobson
Subject: Re: Who would use a 60 tooth chainring?
|
John Forrest Tomlinson wrote:
> Have you ever seen the problem you fear?
I've seen a photo of a small fixed cog with broken teeth, yes. I was
not however, privy to the context in which the failure occurred.
As I stated earlier, I'm open to the notion that I'm being paranoid. No
one I know rides smaller than a 14T or 13T cog, especially on the
streets. LBSs around here advise against almost universally[1].
\\paul
[1] I haven't talked to *every* employee
|
| | | | | | | | |
Date: 19 Jul 2007 00:15:57
From: Booker C. Bense
Subject: Re: Who would use a 60 tooth chainring?
|
In article <f7m3ub$1b4$1@news-int.gatech.edu >,
Paul Myron Hobson <fobson@gatech.edu > wrote:
>John Forrest Tomlinson wrote:
>> Have you ever seen the problem you fear?
>
>I've seen a photo of a small fixed cog with broken teeth, yes. I was
>not however, privy to the context in which the failure occurred.
>
>As I stated earlier, I'm open to the notion that I'm being paranoid. No
>one I know rides smaller than a 14T or 13T cog, especially on the
>streets. LBSs around here advise against almost universally[1].
According to Sheldon Brown you need a special lockring to use 12t
cogs. 11t cogs aren't available. Doesn't matter if it breaks if
the chain won't stay on.
http://www.sheldonbrown.com/harris/fixed-sprockets.html
_ Booker C. Bense
|
| | | | | | | | | |
Date: 18 Jul 2007 20:59:24
From: Paul Myron Hobson
Subject: Re: Who would use a 60 tooth chainring?
|
Booker C. Bense wrote:
> In article <f7m3ub$1b4$1@news-int.gatech.edu>,
> Paul Myron Hobson <fobson@gatech.edu> wrote:
>> John Forrest Tomlinson wrote:
>>> Have you ever seen the problem you fear?
>> I've seen a photo of a small fixed cog with broken teeth, yes. I was
>> not however, privy to the context in which the failure occurred.
>>
>> As I stated earlier, I'm open to the notion that I'm being paranoid. No
>> one I know rides smaller than a 14T or 13T cog, especially on the
>> streets. LBSs around here advise against almost universally[1].
>
> According to Sheldon Brown you need a special lockring to use 12t
> cogs. 11t cogs aren't available. Doesn't matter if it breaks if
> the chain won't stay on.
My post was poorly worded. What I meant to say was:
a) no one uses cogs smaller than 15T
or
b) no one uses 13T or 14T cogs.
I'm talking fixies too.
\\paul
|
| | | | | | | | | | |
Date: 19 Jul 2007 22:49:11
From: Booker C. Bense
Subject: Re: Who would use a 60 tooth chainring?
|
In article <f7md18$4iu$1@news-int.gatech.edu >,
Paul Myron Hobson <fobson@gatech.edu > wrote:
>Booker C. Bense wrote:
>> In article <f7m3ub$1b4$1@news-int.gatech.edu>,
>> Paul Myron Hobson <fobson@gatech.edu> wrote:
>>> John Forrest Tomlinson wrote:
>>>> Have you ever seen the problem you fear?
>>> I've seen a photo of a small fixed cog with broken teeth, yes. I was
>>> not however, privy to the context in which the failure occurred.
>>>
>>> As I stated earlier, I'm open to the notion that I'm being paranoid. No
>>> one I know rides smaller than a 14T or 13T cog, especially on the
>>> streets. LBSs around here advise against almost universally[1].
>>
>> According to Sheldon Brown you need a special lockring to use 12t
>> cogs. 11t cogs aren't available. Doesn't matter if it breaks if
>> the chain won't stay on.
>
>My post was poorly worded. What I meant to say was:
>
>a) no one uses cogs smaller than 15T
> or
>b) no one uses 13T or 14T cogs.
>
>I'm talking fixies too.
>\\paul
Well, for general purpose road riding 42/14 is a pretty stiff
gear for most people. I would guess that that has more to do with
their recommendations than any breakage issues. I'm sure there
are plenty of 14t and 13t cogs being ridden hard at most velodromes.
Personally, I like big/big on my fixed gear bikes. I run either
50/18 or 53/19. I can't come up with any sustainable rational
explanation for it though.
For whatwever reason, people think fixed gears put more stress on
the parts, but a gear is a gear. In general for a given gear, a
fixed gear setup gets less stress because of the optimized
chainline and chain tension.
_ Booker C. Bense
|
| | | | | | | | | | | |
Date: 19 Jul 2007 23:27:13
From: Paul Myron Hobson
Subject: Re: Who would use a 60 tooth chainring?
|
Booker C. Bense wrote:
> Well, for general purpose road riding 42/14 is a pretty stiff
> gear for most people. I would guess that that has more to do with
> their recommendations than any breakage issues. I'm sure there
> are plenty of 14t and 13t cogs being ridden hard at most velodromes.
>
> Personally, I like big/big on my fixed gear bikes. I run either
> 50/18 or 53/19. I can't come up with any sustainable rational
> explanation for it though.
Good man. I was a 48x18 kind of guy until my frame got trashed. That
combo didn't work on the new one so I went to 46x17 (before adding a
9spd drive train). But larger gears do spread out the wear over more
teeth...can't be a bad thing. The larger curves of the chain apparently
have been attributed to better efficiency too.
> For whatwever reason, people think fixed gears put more stress on
> the parts, but a gear is a gear. In general for a given gear, a
> fixed gear setup gets less stress because of the optimized
> chainline and chain tension.
True, but the folks I was talking about ride no brakes and ride *hard*
on the street (Don't tell me they're idiots; I know they are). Even I,
at a mere 135 lbs. and more than willing to use my brake have cogs and
chain rings with noticeable wear and deformation on the backside of the
teeth from back pedaling. Maybe my chain tension was too high, but I
was using this as my reference point:
http://www.yellowjersey.org/chainchk.html
Here's my chain ring
http://www.flickr.com/photos/p_myron_h/856454974/
There is an "All Sizes" button above the photo if you'd like a closer look.
\\paul
|
| | | | | | | | |
Date: 18 Jul 2007 17:54:15
From:
Subject: Re: Who would use a 60 tooth chainring?
|
On Wed, 18 Jul 2007 18:24:14 -0400, Paul Myron Hobson
<phobson@gatech.edu > wrote:
>John Forrest Tomlinson wrote:
>> Have you ever seen the problem you fear?
>
>I've seen a photo of a small fixed cog with broken teeth, yes. I was
>not however, privy to the context in which the failure occurred.
>
>As I stated earlier, I'm open to the notion that I'm being paranoid. No
>one I know rides smaller than a 14T or 13T cog, especially on the
>streets. LBSs around here advise against almost universally[1].
>
>\\paul
>
>[1] I haven't talked to *every* employee
Dear Paul,
At the same mph, a smaller rear sprocket does raise chain tension, but
most of the force on any sprocket is handled by the last tooth before
the free chain run begins.
I mash happily in 53x11 at 20-25 mph for most of my daily 15-mile
ride, having switched from 52x12 years ago.
The small rear sprocket wears faster because there are fewer teeth,
the tension is higher, and the chain path is worse.
But no teeth have broken in the last 100,000 miles or so.
Even the most powerful sprinter can't tear the teeth off a bicycle
sprocket--teeth break when there's extraordinary wear, when the chain
skips wildly, or when a crash or debris smashes them.
Cheers,
Carl Fogel
|
| | | | | | | | | |
Date: 18 Jul 2007 23:53:35
From: A Muzi
Subject: Re: Who would use a 60 tooth chainring?
|
>> John Forrest Tomlinson wrote:
>>> Have you ever seen the problem you fear?
> Paul Myron Hobson <phobson@gatech.edu> wrote:
>> I've seen a photo of a small fixed cog with broken teeth, yes. I was
>> not however, privy to the context in which the failure occurred.
>> As I stated earlier, I'm open to the notion that I'm being paranoid. No
>> one I know rides smaller than a 14T or 13T cog, especially on the
>> streets. LBSs around here advise against almost universally[1].
>> [1] I haven't talked to *every* employee
carlfogel@comcast.net wrote:
> At the same mph, a smaller rear sprocket does raise chain tension, but
> most of the force on any sprocket is handled by the last tooth before
> the free chain run begins.
>
> I mash happily in 53x11 at 20-25 mph for most of my daily 15-mile
> ride, having switched from 52x12 years ago.
>
> The small rear sprocket wears faster because there are fewer teeth,
> the tension is higher, and the chain path is worse.
>
> But no teeth have broken in the last 100,000 miles or so.
>
> Even the most powerful sprinter can't tear the teeth off a bicycle
> sprocket--teeth break when there's extraordinary wear, when the chain
> skips wildly, or when a crash or debris smashes them.
Agreed. And well phrased. Broken teeth are seen on a few infamous
design-error (not current) models of seven freewheel and 7/8 cassette.
Those are outliers.
Damaged teeth on fixed systems, both front and rear, usually follow from
wildly erratic chainline or excessive chain tension, both anomalies. I
saw two-week-old Campagnolo Record Pista chainring teeth reduced to
rounded lumps under an excessively tensioned worn chain.
(just because there's a chain adjuster doesn't mean one should screw it
in as tight as one is able with a long allen wrench)
--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971
|
| | | | | | | | | | |
Date: 20 Jul 2007 08:01:43
From: Helmut Springer
Subject: Re: Who would use a 60 tooth chainring?
|
A Muzi <am@yellowjersey.org > wrote:
> (just because there's a chain adjuster doesn't mean one should
> screw it in as tight as one is able with a long allen wrench)
Even hurts while reading it *ouch*
--
MfG/Best regards
helmut springer
|
| | | | | | | | | | |
Date: 19 Jul 2007 19:16:18
From: Michael Press
Subject: Re: Who would use a 60 tooth chainring?
|
In article <139trireom60u8d@corp.supernews.com >,
A Muzi <am@yellowjersey.org > wrote:
> (just because there's a chain adjuster doesn't mean one should screw it
> in as tight as one is able with a long allen wrench)
Absolutely. Now what's the torque setting for that bolt?
--
Michael Press
|
| | | | | | | | | |
Date: 18 Jul 2007 20:08:23
From: Barry
Subject: Re: Who would use a 60 tooth chainring?
|
> I mash happily in 53x11 at 20-25 mph for most of my daily 15-mile
> ride
What size wheel do you use? With standard 700mm road wheels and tires, this
corresponds to a cadence of only about 53 to 67 rpm. Why not use a lower gear
and spin at a higher cadence?
|
| | | | | | | | | | |
Date: 18 Jul 2007 23:57:31
From: A Muzi
Subject: Re: Who would use a 60 tooth chainring?
|
Carl Fogel:
>> I mash happily in 53x11 at 20-25 mph for most of my daily 15-mile
>> ride
Barry wrote:
> What size wheel do you use? With standard 700mm road wheels and tires, this
> corresponds to a cadence of only about 53 to 67 rpm. Why not use a lower gear
> and spin at a higher cadence?
Because people like what they like. Because they like it.
No amount of 'should' seems to change riders' cadence or gear opinions,
outside actual competition. One may well ask why you and I don't emulate
him. In my case, it's because I prefer my usual 90rpm. For no good reason.
--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971
|
| | | | | | | | | | |
Date: 18 Jul 2007 20:12:02
From:
Subject: Re: Who would use a 60 tooth chainring?
|
On Wed, 18 Jul 2007 20:08:23 -0400, "Barry" <a@b.c > wrote:
>> I mash happily in 53x11 at 20-25 mph for most of my daily 15-mile
>> ride
>
>What size wheel do you use? With standard 700mm road wheels and tires, this
>corresponds to a cadence of only about 53 to 67 rpm. Why not use a lower gear
>and spin at a higher cadence?
Dear Barry,
Posters on RBT are often surprised to learn that most riders end up at
that rpm when left to their own devices--in some ways, it's the most
efficient cadence.
In a thread with many comments about how most (though not all) riders
lower their cadence on hills, Robert Chung mentioned that studies
indicate maximum efficiency is around 50~60 rpm and drops as cadence
increases:
http://groups.google.com/group/rec.bicycles.tech/msg/f206ae932369120f
There are advantages to 90 rpm in competition, but few riders are
actually competing, so they don't bother to spin so briskly. Thrashing
your legs up and down 50% faster to go the same speed takes more
effort.
Cheers,
Carl Fogel
|
| | | | | | | | | | |
Date: 18 Jul 2007 19:58:03
From: Johnny Sunset aka Tom Sherman
Subject: Re: Who would use a 60 tooth chainring?
|
Barry Nolastname wrote:
> ...With standard 700mm road wheels and tires...
No such thing exists for bicycles. The ISO 622-mm size is often (and
unfortunately) referred to by its obsolete French designation "700C"
which implies a tire with an outside diameter of 700-mm (when inflated)
on a rim with a bead seat diameter of 622-mm.
--
Tom Sherman - Holstein-Friesland Bovinia
The weather is here, wish you were beautiful
--
Posted via a free Usenet account from http://www.teranews.com
|
| | | | | | | | | | |
Date: 18 Jul 2007 20:18:50
From: John Forrest Tomlinson
Subject: Re: Who would use a 60 tooth chainring?
|
On Wed, 18 Jul 2007 20:08:23 -0400, "Barry" <a@b.c > wrote:
>> I mash happily in 53x11 at 20-25 mph for most of my daily 15-mile
>> ride
>
>What size wheel do you use? With standard 700mm road wheels and tires, this
>corresponds to a cadence of only about 53 to 67 rpm. Why not use a lower gear
>and spin at a higher cadence?
Why use a lower gear and spin at a higher cadence?
--
JT
****************************
Remove "remove" to reply
Visit http://www.jt10000.com
****************************
|
| | |
Date: 17 Jul 2007 13:07:58
From: Neil Brooks
Subject: Re: Who would use a 60 tooth chainring?
|
On Tue, 17 Jul 2007 21:03:52 +0100, Zog The Undeniable
<hrothgar19@yahoo.com > wrote:
>almost_fast@yahoo.com wrote:
>> Saw this:
>> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241
>>
>> ... and while it looks like a nice polished finish, I wonder who would
>> legitimately need such a big ring?
>>
>Time triallists.
>
>A local guy wins 10s and 25s on a 125" fixed gear. That's 60 x 13. On
>fixed you can't have a smaller sprocket, so the chainring has to be bigger.
Yup.
My buddy was at a major national time trial, in Valencia, CA last
year, when he spun out his 56/11 (IIRC) on the with-the-wind, slightly
downhill portion of an out-and-back TT.
He went searching for a 60t and won ... the next day ;-)
|
| |
Date: 17 Jul 2007 13:50:05
From: A Muzi
Subject: Re: Who would use a 60 tooth chainring?
|
almost_fast@yahoo.com wrote:
> Saw this:
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241
> ... and while it looks like a nice polished finish, I wonder who would
> legitimately need such a big ring?
Tandems - although 'need' is sorta ambiguous.
Remember the famous Ron Kitching photo holding a TA cyclotouriste 26t
and a TA special 120t ring ? Ask Jose Meffert about long gearing!
As any bike shop employee will confirm, 53x11 bikes still come in
requesting bigger gearing.
--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971
|
| |
Date: 17 Jul 2007 20:17:59
From: Sandy
Subject: Re: Who would use a 60 tooth chainring?
|
Dans le message de
news:1184694231.425998.271100@d30g2000prg.googlegroups.com,
almost_fast@yahoo.com <almost_fast@yahoo.com > a réfléchi, et puis a déclaré
:
> Saw this:
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241
>
> ... and while it looks like a nice polished finish, I wonder who would
> legitimately need such a big ring?
Only a 60?
There's a guy who rides Longchamps with a 70. Goes along at 30-35 for
hours, mostly en danseuse. He's happy, he says.
--
Sandy
--
Mobilité et stabilité ne sont pas antinomiques :
un cycliste n'est stable sur sa bicyclette
qu'en avançant.
- Chirac, J (who must have read Einstein)
|
| |
Date: 17 Jul 2007 13:59:03
From: dvt
Subject: Re: Who would use a 60 tooth chainring?
|
almost_fast@yahoo.com wrote:
> Saw this:
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241
>
> .... and while it looks like a nice polished finish, I wonder who would
> legitimately need such a big ring?
Bikes with small wheels (folding bikes, 'bents).
--
Dave
dvt at psu dot edu
Everyone confesses that exertion which brings out all the powers of body
and mind is the best thing for us; but most people do all they can to
get rid of it, and as a general rule nobody does much more than
circumstances drive them to do. -Harriet Beecher Stowe, abolitionist and
novelist (1811-1896)
|
| |
Date: 17 Jul 2007 10:48:47
From: * * Chas
Subject: Re: Who would use a 60 tooth chainring?
|
<almost_fast@yahoo.com > wrote in message
news:1184694231.425998.271100@d30g2000prg.googlegroups.com...
> Saw this:
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241
>
> ... and while it looks like a nice polished finish, I wonder who would
> legitimately need such a big ring?
>
On a tandem - 60/13 is easy to spin out on a long hill.
--
Chas. verktygjunk@aol.spamski.com (Drop spamski to E-mail me)
|
| | |
Date: 17 Jul 2007 18:44:42
From: still me
Subject: Re: Who would use a 60 tooth chainring?
|
On Tue, 17 Jul 2007 10:48:47 -0700, "* * Chas"
<verktygjunk@aol.spamski.com > wrote:
>
>On a tandem - 60/13 is easy to spin out on a long hill.
Come now, as a single rider I can spin out 60/13 on the flat!
Oh, wait, you said "60", I thought you said "50". Never mind.
|
|
