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  1. #1
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    Feb 2010

    Geometry differences between pre-'98 and later Truth frames?

    I just sent this basic question directly to Ellsworth, but then it occurred to me that I might get a quicker / more thorough answer here:

    I have a '97 Truth that needs a new fork. I also happen to have an 80mm SID fork that I can take off another less important bike if needed. I know that, for most versions of the Truth, the overwhelming concensus is that a 100mm fork is far superior to an 80mm fork. But I'm wondering if there were any geometry differences on the pre '98 bikes that would make the 80mm fork a more appropriate choice.

    (After all, a 100mm fork was toward the extent of L O N G travel options in 1997, evne though it is pretty mimimum by today's standards. The current truth specifies 100mm as the minimum and only acceptable fork option.)

    FWIW, I had a 90mm White Brothers fork on the bike originally - an in-between size that won't give me a frame of reference for comparison, unfortunately.

    Another more general, but related question: The headtube angle for all versions of the Truth (as far as I can tell) is specified as 71 degrees. Does anybody know if that is calculated with an 80mm or 100mm fork, and if it is with the fork fully extended or appropriately sagged?

    Thanks for any feedback.
    Last edited by iamkeith; 10-27-2011 at 04:07 PM.
    We still hang bike thieves in Wyoming [Pedal House]

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