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Main
Date: 23 May 2007 10:12:35
From: RS
Subject: Does this work? 53x29 w/ 12x32 & XTR RD
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Can it work using a standard front double road crank (53x39) and an
XT/XTR Rear Der. with a wide MTB cassette, like a 12x32. I would try
this on an 8sp drivetrain downtube shifter bike. Will the RD take up
enough slack from the longish chain needed for this?
thanks
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Date: 23 May 2007 18:27:05
From: Clive George
Subject: Re: Does this work? 53x29 w/ 12x32 & XTR RD
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"RS" <r_schiller@comcast.net > wrote in message
news:cOqdnZcQGcNi6MnbnZ2dnUVZ_j6dnZ2d@comcast.com...
> Can it work using a standard front double road crank (53x39) and an
> XT/XTR Rear Der. with a wide MTB cassette, like a 12x32. I would try
> this on an 8sp drivetrain downtube shifter bike. Will the RD take up
> enough slack from the longish chain needed for this?
Yes, it'll be fine. Think of it this way : the 14t difference in the front
is less than the 20t or 22t difference bewteen the big and small chainrings
the rear mech is designed for.
cheers,
clive
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Date: 23 May 2007 19:10:13
From: cal
Subject: Re: Does this work? 53x29 w/ 12x32 & XTR RD
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On Wed, 23 May 2007 18:27:05 +0100, "Clive George"
<clive@xxxx-x.fsnet.co.uk > wrote:
>"RS" <r_schiller@comcast.net> wrote in message
>news:cOqdnZcQGcNi6MnbnZ2dnUVZ_j6dnZ2d@comcast.com...
>> Can it work using a standard front double road crank (53x39) and an
>> XT/XTR Rear Der. with a wide MTB cassette, like a 12x32. I would try
>> this on an 8sp drivetrain downtube shifter bike. Will the RD take up
>> enough slack from the longish chain needed for this?
>
>Yes, it'll be fine. Think of it this way : the 14t difference in the front
>is less than the 20t or 22t difference bewteen the big and small chainrings
>the rear mech is designed for.
>
>cheers,
>clive
Won't there be a problem with a 29 tooth chainring and a 130mm dia
bolt circle? I believe 38 is about as small as you can go with 130mm
bolt circle. Right?
Cal
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Date: 23 May 2007 23:03:15
From: RS
Subject: Re: Does this work? 53xTHIRTY-NINE w/ 12x32 & XTR RD
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In article <nai953l598rs58q5f0td64cqevqg2c1s9t@4ax.com >, c@cal.com
says...
>
>
>On Wed, 23 May 2007 18:27:05 +0100, "Clive George"
><clive@xxxx-x.fsnet.co.uk> wrote:
>
>>"RS" <r_schiller@comcast.net> wrote in message
>>news:cOqdnZcQGcNi6MnbnZ2dnUVZ_j6dnZ2d@comcast.com...
>>> Can it work using a standard front double road crank (53x39) and an
>>> XT/XTR Rear Der. with a wide MTB cassette, like a 12x32. I would try
>>> this on an 8sp drivetrain downtube shifter bike. Will the RD take up
>>> enough slack from the longish chain needed for this?
>>
>>Yes, it'll be fine. Think of it this way : the 14t difference in the front
>>is less than the 20t or 22t difference bewteen the big and small chainrings
>>the rear mech is designed for.
>>
>>cheers,
>>clive
>
>
>Won't there be a problem with a 29 tooth chainring and a 130mm dia
>bolt circle? I believe 38 is about as small as you can go with 130mm
>bolt circle. Right?
>
>Cal
I meant THIRTY-NINE, not 29 . . stupid typo at the wrong time.
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Date: 24 May 2007 00:28:13
From: Clive George
Subject: Re: Does this work? 53x29 w/ 12x32 & XTR RD
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"cal" <c@cal.com > wrote in message
news:nai953l598rs58q5f0td64cqevqg2c1s9t@4ax.com...
> On Wed, 23 May 2007 18:27:05 +0100, "Clive George"
> <clive@xxxx-x.fsnet.co.uk> wrote:
>
>>"RS" <r_schiller@comcast.net> wrote in message
>>news:cOqdnZcQGcNi6MnbnZ2dnUVZ_j6dnZ2d@comcast.com...
>>> Can it work using a standard front double road crank (53x39) and an
>>> XT/XTR Rear Der. with a wide MTB cassette, like a 12x32. I would try
>>> this on an 8sp drivetrain downtube shifter bike. Will the RD take up
>>> enough slack from the longish chain needed for this?
>>
>>Yes, it'll be fine. Think of it this way : the 14t difference in the front
>>is less than the 20t or 22t difference bewteen the big and small
>>chainrings
>>the rear mech is designed for.
>
> Won't there be a problem with a 29 tooth chainring and a 130mm dia
> bolt circle? I believe 38 is about as small as you can go with 130mm
> bolt circle. Right?
Indeed. Fortunately the OP is talking about using a 39t chainring, as can be
seen in the quoted text, so everything will be ok.
cheers,
clive
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