Old bike, new fork- Mtbr.com
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  1. #1
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    Old bike, new fork

    Hi all

    I have a 1992 KHS Montaņa Descent bike. It currently has a 1" threaded headset with a Rockshox Mag 20 fork.

    The Mag 20 does not longer work well so I was wondering whether there is a way to fit a 1' 1/8 threadless fork to this frame, as I have 2 forks I am not currently using that I could use in the KHS.

    Any ideas?

    Thanks

  2. #2
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    Quote Originally Posted by BiciMapas View Post
    Hi all

    I have a 1992 KHS Montaņa Descent bike. It currently has a 1" threaded headset with a Rockshox Mag 20 fork.

    The Mag 20 does not longer work well so I was wondering whether there is a way to fit a 1' 1/8 threadless fork to this frame, as I have 2 forks I am not currently using that I could use in the KHS.

    Any ideas?

    Thanks

    Despite the other recent thread showing a guy getting a 1 1/8" fork into a Klunker....no, it can't be done. Not safely or cheaply anyway.

    Mag20 (and Mag21) forks are pretty readily available. Find one in good working shape and swap out the lowers. Or send your fork to Hippietech Suspension and Jerry can rebuild it good as new.
    -eric-

    http://www.rumpfy.com
    Wanted: NDS Suntour XC Pro Microdrive 175mm Crank Arm.

  3. #3
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    I dont think there are any off-the-shelf adapters that allow you to put a 1-1/8" fork into a headtube meant for 1" fork. The larger 28.6mm steer tube will fit inside the 30.0mm ID/ 31.7mm OD headtube typical for a 1" fork so one possibility would be to modify the frame to accept a 1-1/8" headset which is meant to slip inside a 34mm ID headtube. Machine two thick bushing rings that are 36mm OD and 31.7mm ID and slip them over the existing headtube ends and braze into place. Once they are brazed on, use appropriate size headtube reamer to enlarge the ID of the bushing up to 34.0mm to secure the larger headset. This would likely lengthen the headtube a bit, raise the front end slightly. Shouldnt be too difficult of an operation for a framebuilder with correct tooling but would likely be cost prohibitive operation for this frame.

  4. #4
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    Or, have a frame builder put on a 1 1/8 head tube and while the bike is apart adjust the geometry for a modern forks travel.
    Wala.....
    Seek: Koski Trailmaster. Breezer Series 2 or 3. Cunningham Racer.

  5. #5
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    Thanks to all for your ideas. Swaping the steerer tube seems to be the best and safest option. So I went to the LBS with the fork and they told me they could fit a 1" threaded steerer tube into the fork. It will be ready in a week and will cost about $ 30 usd. Not bad at all. I will let you know how it all works

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