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  1. #1
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    Mar 2012
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    Replacing forks, measurement question

    Hi and thanks in advance. I have a Trek 4600 that has RS Judy tt suspension forks on it. They are frozen and I am looking to replace them but i am not sure what measurements i need to look for when purchasing. wondering if someone might know off hand or tell me what i should measure to find for myself.

  2. #2
    Senior Member
    Join Date
    Feb 2009
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    USA
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    Steerer tube diameter (it's probably 1 1/8", but it doesn't hurt to measure)
    Steerer tube length: New fork steerer must be at least as long as the one it's replacing.
    Axle to crown: From the axle to the top of the fork arch where the headset crown race sits. (Probably ~425ish mm)

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