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  1. #1
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    New question here. Do I Need A New Fork? noob

    Hello All

    Just starting MTBing this year- havn't really rode for 20 or so years! Any who, I just picked up a 2000 GT Rebound early this summer, it has a Rock Shox Judy XC on it.

    When I use the front brake (linear pull) the front shock shudders.

    There is no feel of play in the stanchions, I took the fork apart partially and the bushings look good and feel good- put in new 5 weight oil.

    I cleaned up the wheel where the brake pads ride ( not sure if I did it correctly) thinking it is more of brake issue causing the fork to vibrate/shudder front to back.

    Any input would be appretiated

    Don

  2. #2
    I4NI
    Reputation: S_Trek's Avatar
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    Seems like you're in the right area. Did you try to scuff the pads also?
    Last edited by S_Trek; 09-12-2011 at 10:41 AM.
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  3. #3
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    Good call! I havn't touched the pads. I did scotch brite the wheel, and that changes it but didn't eliminate it.

    I will have to hit the wheel one more time and scuff the pads to see if that helps!

    Thanks

    Don

  4. #4
    What could go wrong ...
    Reputation: Zoke2's Avatar
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    did you check that the headset is not loose
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  5. #5
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    I would guess it's the headset or the wheel is bent or you have loose spokes before thinking it's the fork.

  6. #6
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    The head set does not have any play that I can feel, I could always tighten it up a hair, it was a little loose when I purchased the bike... how much preload should there be?? Is there a torque spec on the headset (it is thread less)?

    The wheel is true, and the spokes do not feel loose. Unless they are all a hair loose? I haven't put a dial indicator on the wheel but I would guess less than .020".
    How true is considered true?

    I am mechanically inclined- so working on it isn't a problem, just new to the bike thing- when I was a kid I was the neighborhood bike mechanic

    Thank you guys for all your input- I will play with it and let you know

    Don

  7. #7
    i also unicycle
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    headset or slightly loose hub were my two choices if the work itself isn't flexing.
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  8. #8
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    Update

    Just finished tinkering with the bike- it is much better but I can't fully tell until I ride it in the sun light!

    I tighened the headset ( for the third time since the beginning of the summer); I tighened the spokes and trued the wheel ( probably has less than .005" lateral runout); I scuffed the brake pads on some 80 grit and scuffed the wheel with a scotch brite pad.

    I think the headset was the biggest thing- even though I felt no lash, the leverage couldn't be duplicated by hand. I may take the headset apart and regrease the bearings and readjust.

    When I first purchased the bike the front wheel wasn't tightened all the way- good call on checking that too!

    Thank you to all those who gave advice

    I will try it tomorrow (weather permitting) to see how she does!!!

    Don

  9. #9
    Huckin' trails
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    Check if the v-brake posts are not too loose on the fork's v-brake studs... I did ride my RS Dart 2 with v-brakes and was kinda hard on them and the v-brake themselves start having play, but the studs are ok... They should have a little play anyway, but if you brake suddenly and heard a "clank", then it might be the brake arms that are getting loose... Just have to change them.

    David
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  10. #10
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    Update

  11. #11
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    Whoops- musta hit wrong button

    The shudder is probably half or so gone

    I took the headset apart last night and cleaned and greased the bearings and adjust the headset.

    There must be just a little play that I can't feel in the fork bushings/ something going on with the wheel brake pad surface causing the shudder. At least it does it at higher speeds instead of all the time.

    I will continue messing with it and keep all updated.

    Thanks again for all the input

    Don

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