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  1. #1
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    100mm forks vs 120mm forks ?????

    I have a set of 100mm forks and Id like to swap them out for a set of 120mm forks.
    So my questions is. Will this change the way the bike will handle? How big of a difference will there be ?

  2. #2
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    Assuing the 120 mm fork is 20 mm longer than the 100 mm model:
    You'd end up with a slacker head tube angle (just over 1 degree less) which will slow your steering a bit. Your handle bar would move up about 20 mm. Your seat tube angle and saddle would also change by about 1 degree so your saddle would need a small angle and position adjustment to put it back in the same place relative to your bottom bracket.

  3. #3
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    Reputation: Joules's Avatar
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    Quote Originally Posted by Slapaho View Post
    So my questions is. Will this change the way the bike will handle?
    yes.


    Quote Originally Posted by Slapaho View Post
    How big of a difference will there be ?
    about that much.

    in all seriousness, you will probably notice it, but it may be an improvement or not depending on how much you like the handling of your bike as it is (if you really like how your bike handles, you probably shouldn't change it). It will not be a drastic difference in any event. And of course there's offset, are the new and old forks the same?

  4. #4
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    What length fork is your frame designed for?



    SPP
    Rigid.

  5. #5
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    I put a 120mm Manitou Tower Pro on my GT Karakoram 2.0, which came with a 100mm XC 28 fork. I made thread about putting it on that also includes my thoughts after riding it:

    Put a 120mm Manitou Tower Pro on my Karakoram 2.0 (Install story and photos)

    I absolutely love the new fork and I am glad that I did it and thought I'd share my first hand experience, in case that feedback is helpful.

  6. #6
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    If you went with a 51 mm offset fork (G2) you might regain any slowness caused by the slacker head tube angle. If you went with a TALAS you could get your front end back to it's original height for climbing. I had just such a fork in the classifieds, but the add expired. I still have it.
    I extended the fork on a Fisher Rig from 80 to 100 a few years ago. I liked the result.

  7. #7
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    i did it and 3/4" isn't going to hurt. i'd be surprised if you could even tell.

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