Cooks Bros. Racing RSR Q-Factor/Bottom Bracket Question- Mtbr.com
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  1. #1
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    Cooks Bros. Racing RSR Q-Factor/Bottom Bracket Question

    The Cooks Bros. Racing RSR is documented as having a Q-Factor of 167mm. Does anyone recall what bottom bracket length was used to determine this? Back in 1996, I used a 122.5mm TNT Ti BB on my RSRs but can't remember if that was the recommended width.

    Thanks in advance.

    Note: I should say that BikePro is the only place I was even able to find the Q-Factor measurement. They explained that they used a 111mm Campy bottom bracket to achieve their numbers. I can see using this width for a road bike, but certainly not for mountain applications.
    Last edited by misterdangerpants; 07-11-2014 at 06:17 AM.

  2. #2
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    I'm not sure what the Q-factor is, but can confirm that the Cook's cranks require a long BB spindle. With a 111mm spindle, the arms are likely to hit the chain stays.
    Each bicycle owned exponentially increases the probability that none is working correctly.

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    I recall something about 127mm being the default size for the RSR but again, it's been awhile.
    Last edited by misterdangerpants; 07-11-2014 at 12:10 PM. Reason: Removed graphic.

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    lol I know what "q-factor" is. I don't know the "q-factor" of Cook cranks. I should have been more clear.
    Each bicycle owned exponentially increases the probability that none is working correctly.

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    Quote Originally Posted by laffeaux View Post
    lol I know what "q-factor" is. I don't know the "q-factor" of Cook cranks. I should have been more clear.
    I am long overdue for a new eyeglasses prescription....

  6. #6
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    Quote Originally Posted by misterdangerpants View Post
    The Cooks Bros. Racing RSR is documented as having a Q-Factor of 167mm. Does anyone recall what bottom bracket length was used to determine this? Back in 1996, I used a 122.5mm TNT Ti BB on my RSRs but can't remember if that was the recommended width.

    Thanks in advance.

    Note: I should say that BikePro is the only place I was even able to find the Q-Factor measurement. They explained that they used a 111mm Campy bottom bracket to achieve their numbers. I can see using this width for a road bike, but certainly not for mountain applications.
    Did you ever find an answer to this? Because Campy bbs are ISO chances are the cranks went farther in than with a JIS bb..

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