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Main
Date: 15 Oct 2007 13:05:16
From: Colin Campbell
Subject: Circumference setting for a 700 x 20 tire?
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I run a Continental 700 X 20 front tire (700 x 23 rear) on my track
bike. I decided that I'd go to the track last weekend, since our club
had arranged for a "track day". My old, old, Vetta HR1000 computer had
a dead battery, and I had not written down the tire setting for easy reset.
I have Vittoria Rubino Pro 700 x 23 on one road bike, and Bontrager 700
x 25 on the other. Both Ciclomaster computers are set to 2093, though I
believe the bike with the Bontrager tires should probably be set to 2094
or 2095; it seems to ever so slightly underregister my distance. The
manual for the Ciclomaster says I ought to be using 2133(!) for the
circumference with a 700 x 23, and 2114 for a 700 x 20.
By Googling, I found this helpful web site with setup instructions for
many different computers, including mine:
http://michaelscycles.net/page.cfm?pageID=161#VettaHR1000HeartRate
It also has a chart showing settings for circumference. The Vetta
HR1000 is a group F computer, and this chart says to use 2097 for 700 x
23, and 2086 for 700 x 20.
So, I'm thinking that 2084 might be a good place to start.
Any better ideas?
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Date: 18 Oct 2007 07:30:06
From: bjw@mambo.ucolick.org
Subject: Re: Circumference setting for a 700 x 20 tire?
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On Oct 17, 11:13 pm, Tom Sherman <sunsetss0...@yahoo.com > wrote:
> Andrew Muzi mused:
>
> > Why not just ride through a spot of paint and measure dot-to-dot?
>
> I have used both ketchup and mustard for this purpose. I suspect other
> members of the condiment family, such as mayonnaise would also prove
> serviceable.
While mayonnaise provides a creamy and easibly
visible mark, beware! The calibration quickly
goes off without refrigeration. For more
scientific classifications, see:
http://homepage.powerup.com.au/~rhayes/humrmisc/condimmnt1.htm
-Ben
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Date: 18 Oct 2007 19:45:33
From: Tom Sherman
Subject: Re: Circumference setting for a 700 x 20 tire?
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bjw@mambo.ucolick.org aka Ben ? wrote:
> On Oct 17, 11:13 pm, Tom Sherman <sunsetss0...@yahoo.com> wrote:
>> Andrew Muzi mused:
>>
>>> Why not just ride through a spot of paint and measure dot-to-dot?
>> I have used both ketchup and mustard for this purpose. I suspect other
>> members of the condiment family, such as mayonnaise would also prove
>> serviceable.
>
> While mayonnaise provides a creamy and easibly
> visible mark, beware! The calibration quickly
> goes off without refrigeration. For more
> scientific classifications, see:
>
> http://homepage.powerup.com.au/~rhayes/humrmisc/condimmnt1.htm
I presume a copy of the above is taped to your refrigerator?
--
Tom Sherman - Holstein-Friesland Bovinia
Beer - It's not just for breakfast anymore!
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Date: 16 Oct 2007 10:02:02
From: John Everett
Subject: Re: Circumference setting for a 700 x 20 tire?
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On Mon, 15 Oct 2007 13:05:16 -0700, Colin Campbell
<cmcampb@adelphia.net > wrote:
>By Googling, I found this helpful web site with setup instructions for
>many different computers, including mine:
>http://michaelscycles.net/page.cfm?pageID=161#VettaHR1000HeartRate
Looks as though Michael's Cycles plagiarized his setup instructions
page from Sheldon Brown's web site. Why did it look familiar? Because
I wrote the HR1000 instructions that Sheldon put on his site over ten
years ago. Sheldon had my permission (nay, blessing), Michael doesn't.
:-(
--
jeverett3<AT >sbcglobal<DOT>net (John V. Everett)
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Date: 15 Oct 2007 23:47:54
From: datakoll
Subject: Re: Circumference setting for a 700 x 20 tire?
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first time out with a cateye enduro. Riding up the Blvd against marks
laid down for a 11 mile run for the retarded, the first 4 marks were
25-30' off the cateye. I watched closely and LO! the cateye's miles
fell on a mark, then another, and a third.
turns out the first 11 miler marks were wrong and the cateye's mark
were correct - by 6-7 inches !
using the mark-mark mark-mark method on a concrete slab
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Date: 15 Oct 2007 17:56:34
From: A Muzi
Subject: Re: Circumference setting for a 700 x 20 tire?
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Colin Campbell wrote:
> I run a Continental 700 X 20 front tire (700 x 23 rear) on my track
> bike. I decided that I'd go to the track last weekend, since our club
> had arranged for a "track day". My old, old, Vetta HR1000 computer had
> a dead battery, and I had not written down the tire setting for easy reset.
>
> I have Vittoria Rubino Pro 700 x 23 on one road bike, and Bontrager 700
> x 25 on the other. Both Ciclomaster computers are set to 2093, though I
> believe the bike with the Bontrager tires should probably be set to 2094
> or 2095; it seems to ever so slightly underregister my distance. The
> manual for the Ciclomaster says I ought to be using 2133(!) for the
> circumference with a 700 x 23, and 2114 for a 700 x 20.
>
> By Googling, I found this helpful web site with setup instructions for
> many different computers, including mine:
> http://michaelscycles.net/page.cfm?pageID=161#VettaHR1000HeartRate
> It also has a chart showing settings for circumference. The Vetta
> HR1000 is a group F computer, and this chart says to use 2097 for 700 x
> 23, and 2086 for 700 x 20.
>
> So, I'm thinking that 2084 might be a good place to start.
>
> Any better ideas?
Why not just ride through a spot of paint and measure dot-to-dot?
--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971
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Date: 18 Oct 2007 01:13:42
From: Tom Sherman
Subject: Re: Circumference setting for a 700 x 20 tire?
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Andrew Muzi mused:
> Colin Campbell wrote:
>> I run a Continental 700 X 20 front tire (700 x 23 rear) on my track
>> bike. I decided that I'd go to the track last weekend, since our club
>> had arranged for a "track day". My old, old, Vetta HR1000 computer
>> had a dead battery, and I had not written down the tire setting for
>> easy reset.
>>
>> I have Vittoria Rubino Pro 700 x 23 on one road bike, and Bontrager
>> 700 x 25 on the other. Both Ciclomaster computers are set to 2093,
>> though I believe the bike with the Bontrager tires should probably be
>> set to 2094 or 2095; it seems to ever so slightly underregister my
>> distance. The manual for the Ciclomaster says I ought to be using
>> 2133(!) for the circumference with a 700 x 23, and 2114 for a 700 x 20.
>>
>> By Googling, I found this helpful web site with setup instructions for
>> many different computers, including mine:
>> http://michaelscycles.net/page.cfm?pageID=161#VettaHR1000HeartRate
>> It also has a chart showing settings for circumference. The Vetta
>> HR1000 is a group F computer, and this chart says to use 2097 for 700
>> x 23, and 2086 for 700 x 20.
>>
>> So, I'm thinking that 2084 might be a good place to start.
>>
>> Any better ideas?
>
> Why not just ride through a spot of paint and measure dot-to-dot?
I have used both ketchup and mustard for this purpose. I suspect other
members of the condiment family, such as mayonnaise would also prove
serviceable.
--
Tom Sherman - Holstein-Friesland Bovinia
Beer - It's not just for breakfast anymore!
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Date: 15 Oct 2007 22:38:10
From: Kinky Cowboy
Subject: Re: Circumference setting for a 700 x 20 tire?
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On Mon, 15 Oct 2007 13:05:16 -0700, Colin Campbell
<cmcampb@adelphia.net > wrote:
>By Googling, I found this helpful web site with setup instructions for
>many different computers, including mine:
>http://michaelscycles.net/page.cfm?pageID=161#VettaHR1000HeartRate
>It also has a chart showing settings for circumference. The Vetta
>HR1000 is a group F computer, and this chart says to use 2097 for 700 x
>23, and 2086 for 700 x 20.
>
>So, I'm thinking that 2084 might be a good place to start.
>
>Any better ideas?
Depends on your tyre pressure, weight and weight distribution. It also
depends how obsessive you want to be; by following the procedures of
Cycling Time Trials for course measurement, you can probably get your
computer calibrated with reasonable accuracy. I worked backwards by
adjusting my circumference figure in successive ten mile TTs until I
got a reading of exactly 10 miles from start to finish (CTT courses
are nominally 0.05% long +/- errors in the 0.01% range), and ended up
with 2070mm for a Veloflex Record 700x20 at 8 bar with my 95kg weight
aboard. Depending on which Conti tyre you're using, you'll get a
higher figure than that to account for the thicker tread, +/- any
adjustment for differences in tyre pressure and your weight.
Kinky Cowboy*
*Batteries not included
May contain traces of nuts
Your milage may vary
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Date: 15 Oct 2007 13:30:25
From: landotter
Subject: Re: Circumference setting for a 700 x 20 tire?
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On Oct 15, 3:05 pm, Colin Campbell <cmca...@adelphia.net > wrote:
> I run a Continental 700 X 20 front tire (700 x 23 rear) on my track
> bike. I decided that I'd go to the track last weekend, since our club
> had arranged for a "track day". My old, old, Vetta HR1000 computer had
> a dead battery, and I had not written down the tire setting for easy reset.
>
> I have Vittoria Rubino Pro 700 x 23 on one road bike, and Bontrager 700
> x 25 on the other. Both Ciclomaster computers are set to 2093, though I
> believe the bike with the Bontrager tires should probably be set to 2094
> or 2095; it seems to ever so slightly underregister my distance. The
> manual for the Ciclomaster says I ought to be using 2133(!) for the
> circumference with a 700 x 23, and 2114 for a 700 x 20.
>
> By Googling, I found this helpful web site with setup instructions for
> many different computers, including mine:http://michaelscycles.net/page.cfm?pageID=161#VettaHR1000HeartRate
> It also has a chart showing settings for circumference. The Vetta
> HR1000 is a group F computer, and this chart says to use 2097 for 700 x
> 23, and 2086 for 700 x 20.
>
> So, I'm thinking that 2084 might be a good place to start.
>
> Any better ideas?
Yeah, put a little mark on the tire, roll out with you sitting on the
bike, measure. Ya know, the normal way.
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Date: 17 Oct 2007 08:30:13
From: Colin Campbell
Subject: Re: Circumference setting for a 700 x 20 tire?
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landotter wrote:
> On Oct 15, 3:05 pm, Colin Campbell <cmca...@adelphia.net> wrote:
>> I run a Continental 700 X 20 front tire (700 x 23 rear) on my track
>> bike. I decided that I'd go to the track last weekend, since our club
>> had arranged for a "track day". My old, old, Vetta HR1000 computer had
>> a dead battery, and I had not written down the tire setting for easy reset.
>>
>> I have Vittoria Rubino Pro 700 x 23 on one road bike, and Bontrager 700
>> x 25 on the other. Both Ciclomaster computers are set to 2093, though I
>> believe the bike with the Bontrager tires should probably be set to 2094
>> or 2095; it seems to ever so slightly underregister my distance. The
>> manual for the Ciclomaster says I ought to be using 2133(!) for the
>> circumference with a 700 x 23, and 2114 for a 700 x 20.
>>
>> By Googling, I found this helpful web site with setup instructions for
>> many different computers, including mine:http://michaelscycles.net/page.cfm?pageID=161#VettaHR1000HeartRate
>> It also has a chart showing settings for circumference. The Vetta
>> HR1000 is a group F computer, and this chart says to use 2097 for 700 x
>> 23, and 2086 for 700 x 20.
>>
>> So, I'm thinking that 2084 might be a good place to start.
>>
>> Any better ideas?
>
> Yeah, put a little mark on the tire, roll out with you sitting on the
> bike, measure. Ya know, the normal way.
>
Where do I get the metric measuring tape in the last large country on
earth that refuses to convert from English units? <g >
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Date: 17 Oct 2007 22:48:11
From: Michael Press
Subject: Re: Circumference setting for a 700 x 20 tire?
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In article <47162a74$0$25669$4c368faf@roadrunner.com >,
Colin Campbell <cmcampb@adelphia.net > wrote:
> landotter wrote:
> > On Oct 15, 3:05 pm, Colin Campbell <cmca...@adelphia.net> wrote:
> >> I run a Continental 700 X 20 front tire (700 x 23 rear) on my track
> >> bike. I decided that I'd go to the track last weekend, since our club
> >> had arranged for a "track day". My old, old, Vetta HR1000 computer had
> >> a dead battery, and I had not written down the tire setting for easy reset.
> >>
> >> I have Vittoria Rubino Pro 700 x 23 on one road bike, and Bontrager 700
> >> x 25 on the other. Both Ciclomaster computers are set to 2093, though I
> >> believe the bike with the Bontrager tires should probably be set to 2094
> >> or 2095; it seems to ever so slightly underregister my distance. The
> >> manual for the Ciclomaster says I ought to be using 2133(!) for the
> >> circumference with a 700 x 23, and 2114 for a 700 x 20.
> >>
> >> By Googling, I found this helpful web site with setup instructions for
> >> many different computers, including mine:http://michaelscycles.net/page.cfm?pageID=161#VettaHR1000HeartRate
> >> It also has a chart showing settings for circumference. The Vetta
> >> HR1000 is a group F computer, and this chart says to use 2097 for 700 x
> >> 23, and 2086 for 700 x 20.
> >>
> >> So, I'm thinking that 2084 might be a good place to start.
> >>
> >> Any better ideas?
> >
> > Yeah, put a little mark on the tire, roll out with you sitting on the
> > bike, measure. Ya know, the normal way.
> >
> Where do I get the metric measuring tape in the last large country on
> earth that refuses to convert from English units? <g>
At Ace Hardware, where I got mine.
<http://www.acehardwareoutlet.com/(axw1v4ugbvxlk3qdlzz2to55)/productDetails.aspx?SKU=2138097 >
--
Michael Press
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Date: 17 Oct 2007 22:20:18
From:
Subject: Re: Circumference setting for a 700 x 20 tire?
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On Wed, 17 Oct 2007 08:30:13 -0700, Colin Campbell
<cmcampb@adelphia.net > wrote:
>landotter wrote:
>> On Oct 15, 3:05 pm, Colin Campbell <cmca...@adelphia.net> wrote:
>>> I run a Continental 700 X 20 front tire (700 x 23 rear) on my track
>>> bike. I decided that I'd go to the track last weekend, since our club
>>> had arranged for a "track day". My old, old, Vetta HR1000 computer had
>>> a dead battery, and I had not written down the tire setting for easy reset.
>>>
>>> I have Vittoria Rubino Pro 700 x 23 on one road bike, and Bontrager 700
>>> x 25 on the other. Both Ciclomaster computers are set to 2093, though I
>>> believe the bike with the Bontrager tires should probably be set to 2094
>>> or 2095; it seems to ever so slightly underregister my distance. The
>>> manual for the Ciclomaster says I ought to be using 2133(!) for the
>>> circumference with a 700 x 23, and 2114 for a 700 x 20.
>>>
>>> By Googling, I found this helpful web site with setup instructions for
>>> many different computers, including mine:http://michaelscycles.net/page.cfm?pageID=161#VettaHR1000HeartRate
>>> It also has a chart showing settings for circumference. The Vetta
>>> HR1000 is a group F computer, and this chart says to use 2097 for 700 x
>>> 23, and 2086 for 700 x 20.
>>>
>>> So, I'm thinking that 2084 might be a good place to start.
>>>
>>> Any better ideas?
>>
>> Yeah, put a little mark on the tire, roll out with you sitting on the
>> bike, measure. Ya know, the normal way.
>>
>Where do I get the metric measuring tape in the last large country on
>earth that refuses to convert from English units? <g>
Dear Colin,
Well, 82 & 1/16th inches x 25.4 mm / inch = ~2084 mm
:-)
Cheers,
Carl Fogel
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Date: 15 Oct 2007 17:32:02
From: Wayne Pein
Subject: Re: Circumference setting for a 700 x 20 tire?
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landotter wrote:
> On Oct 15, 3:05 pm, Colin Campbell <cmca...@adelphia.net> wrote:
>
>>I run a Continental 700 X 20 front tire (700 x 23 rear) on my track
>>bike. I decided that I'd go to the track last weekend, since our club
>>had arranged for a "track day". My old, old, Vetta HR1000 computer had
>>a dead battery, and I had not written down the tire setting for easy reset.
>>
>>I have Vittoria Rubino Pro 700 x 23 on one road bike, and Bontrager 700
>>x 25 on the other. Both Ciclomaster computers are set to 2093, though I
>>believe the bike with the Bontrager tires should probably be set to 2094
>>or 2095; it seems to ever so slightly underregister my distance. The
>>manual for the Ciclomaster says I ought to be using 2133(!) for the
>>circumference with a 700 x 23, and 2114 for a 700 x 20.
>>
>>By Googling, I found this helpful web site with setup instructions for
>>many different computers, including mine:http://michaelscycles.net/page.cfm?pageID=161#VettaHR1000HeartRate
>>It also has a chart showing settings for circumference. The Vetta
>>HR1000 is a group F computer, and this chart says to use 2097 for 700 x
>>23, and 2086 for 700 x 20.
>>
>>So, I'm thinking that 2084 might be a good place to start.
>>
>>Any better ideas?
>
>
> Yeah, put a little mark on the tire, roll out with you sitting on the
> bike, measure. Ya know, the normal way.
>
Charts for circumference are often way off. The best way to be accurate
is to do a roll out as suggested.
Wayne
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