juddering on front end

grant43
grant43 Posts: 170
edited October 2011 in MTB workshop & tech
hi my commencals got a sset of rockshox recon 327 u-turn forks up front been up lee quarry today and mostly when travel was set to 140mm every time i pulled front brake got an awful juddering feeling,had a look everything felt tight and ok then when i was riding home i was watching the fork under braking and you could see it juddering near to where the wheel bolts on any ideas??
keep smiling no matter how much it hurts,commencal ramones 1 loving it lol

Comments

  • aidso
    aidso Posts: 493
    Is the skewer tight and of the correct size? Is your wheel buckled and wobbles on rotation?
  • grant43
    grant43 Posts: 170
    its a 20mm bolt thru axle with a skewer going through it ill check it in morning thank you.
    keep smiling no matter how much it hurts,commencal ramones 1 loving it lol
  • nicklouse
    nicklouse Posts: 50,675
    age? last time serviced?
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • ilovedirt
    ilovedirt Posts: 5,798
    Is your headset done up tight?
    Production Privee Shan

    B'Twin Triban 5
  • getonyourbike
    getonyourbike Posts: 2,648
    Headset or fork bushings
  • aidso
    aidso Posts: 493
    I was thinking headset but he said it was shuddering at the bottom. That would make you think the wheel was just loose. If it was the headset you'd feel it in the handlebars...
  • The Rookie
    The Rookie Posts: 27,812
    If the headset is 'loose' the bottom still moves back and forth!

    Simon
    Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.
  • 386ka
    386ka Posts: 479
    Headset or bushings, too.
    A much loved, Giant Trance X3 2010
  • ilovedirt
    ilovedirt Posts: 5,798
    The Beginner wrote:
    If the headset is 'loose' the bottom still moves back and forth!

    Simon
    This, it will be more visible at the bottom than the top
    Production Privee Shan

    B'Twin Triban 5
  • grant43
    grant43 Posts: 170
    not had much chance to look at it today but think headset may be the problem as soon as you pull the brake you can feel it juddering thought it was doing it more when forks were turned up to 140mm but its just the same at 95mm.
    keep smiling no matter how much it hurts,commencal ramones 1 loving it lol
  • ilovedirt
    ilovedirt Posts: 5,798
    pull your front brake and rock back and forth on the front wheel, if it's the headset, you'll feel knocking around the head tube, and you should be able to see the fork crown moving in relation to the headset cups.
    Production Privee Shan

    B'Twin Triban 5
  • grant43
    grant43 Posts: 170
    well no wiser at the moment headset seems ok,forks seem ok,wheels tight,rung local bike shop the mechanic said it could be a case of contaminated disc pads or caliper could have been knocked and be out of alignment and pads wore down at wrong angle
    keep smiling no matter how much it hurts,commencal ramones 1 loving it lol
  • gilesjuk
    gilesjuk Posts: 340
    Swap the pads and clean the discs. This is a cheaper option than doing anything else. Even if it's not the pads you'll still need some in the future anyway, so you can carry on with the old ones if it's not the pads.
  • MountainMonster
    MountainMonster Posts: 7,423
    It really sounds like your headset is not tight enough. Loosen up the bolts for the stem, so that it turns freely in comparison to the forks, and tighten the top cap down to make sure everything is tight, then tighten the stem back up, and see if it still moves around.
    My London Road
  • felix.london
    felix.london Posts: 4,067
    sounds like loose headset to me too
    "Why have that extra tooth if you're not using it?" - Brian Lopes

    Votec V.SX Enduro 'Alpine Thug' 2012/2013 build

    Trek Session 8

Categories