Juicy 5 rear disc rub

aphex2k
aphex2k Posts: 3,229
edited July 2007 in MTB workshop & tech
When I ride I get a faint ting of the rotor touching the caliper every now and again. The calipers are centred and dont rub when the bike is in the stand, only when I'm sitting down and riding. The front is fine and they are both 180mm rotors.

Just keep getting this "cling" sound every so often. I've tried loosening the bolts off and gradually tightening each on, so the disc doesn't warp, but it only happens when I ride.

Anyone else had this problem?
Mark :)

Comments

  • nicklouse
    nicklouse Posts: 50,675
    cheack the condition of the wheel bearings. it could also be frame flex.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • aphex2k
    aphex2k Posts: 3,229
    It's all brand new Nick.

    New set of Magura comp wheels (which I believe are DT Swiss rebadged)

    I did think it was some degree of frame flex as it was more noticable when sitting down or cornering hard. I didn't notice this on my Julies on my old rig, but they were smaller rotors.

    It's not affecting performance and there's not drag, it's just an annoying sound.
    Mark :)
  • nicklouse
    nicklouse Posts: 50,675
    i would then have to say it is flex. there is not much you can do other than see if it is only happening it one direction and they you could ofset the caliper a bit to compensate. but tbh it is not worth it as you could have other probs. what frame is it btw?
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • BlueChameleon
    BlueChameleon Posts: 15
    hmmm i also get this on my Santa cruz BLT with hope m4's bloody noise really gets on my tits so i know where you coming from :(
  • aphex2k
    aphex2k Posts: 3,229
    Pace RC303 Nick

    http://www.flickr.com/photos/41829081@N00/768505010/
    Mark :)
  • nicklouse
    nicklouse Posts: 50,675
    cant comment on that frame other than Sweet.

    are they 185mm? look bigger but hard to see in those pics.

    i also see that both bropout look replaceable. the disc adaptor does bolt onto the disc side dropout.
    i would just ride and see if tou can see exactly what instances make it worse.

    i am thinking peda ing on flat RH corners?
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • aphex2k
    aphex2k Posts: 3,229
    yup - 185 discs and yup, replaceable dropouts

    it's a joy to ride. don't know if you remember my s-works enduro? well i sold that to fund this build. just wasnt getting the ride i wanted from a full susser and much prefer hardtail for the riding i do.
    Mark :)
  • Rockhopper
    Rockhopper Posts: 503
    My brand new Stumpy Comp with Juicy 5's did the same thing (front and back). It was the outer edge of the disk just touching the caliper (not the pads). I simply added a couple of thin washers under the caliper mounting bolts to move the thing out very slightly and its sorted it.
    The fact that i think Juicy 5's are pants is another issue!!
  • aphex2k
    aphex2k Posts: 3,229
    Apart from the rub, there's no issue with me. Each to their own I guess.
    Mark :)
  • JamesB
    JamesB Posts: 1,184
    wait to you have to change the juicy 5 pads .......then you`ll see why they are pants!!. I`ve changed the pads three times on F&R, once OK, twice took ages and ages to do, basically teh pistons get grimey and don`t push back fully into bores, so you can get old (worn thinner) pads out OK, but as for getting new ones in!!!

    Stop OK though, but given pad changing probs I`d buy differently next time.
    Re `ting` sound have you checked rotors to see if any imperfections on the surface? eg scratch or tiny nick ?
  • nicklouse
    nicklouse Posts: 50,675
    JamesBwmb wrote:
    wait to you have to change the juicy 5 pads .......then you`ll see why they are pants!!. I`ve changed the pads three times on F&R, once OK, twice took ages and ages to do, basically teh pistons get grimey and don`t push back fully into bores, so you can get old (worn thinner) pads out OK, but as for getting new ones in!!!

    Stop OK though, but given pad changing probs I`d buy differently next time.
    Re `ting` sound have you checked rotors to see if any imperfections on the surface? eg scratch or tiny nick ?
    james have you had any other disc brakes? as with all things regular maintanence and cleaning. makes things easier to do later.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • JamesB
    JamesB Posts: 1,184
    Yes

    Hope C2 and Aviud BB5, by comparison an absolute dream to change pads.

    I take the point about maintenance but quite how one can get to piston arae behind pads to clean them????
  • aphex2k
    aphex2k Posts: 3,229
    the discs are fine. i think i might loosen off the disc bolts and re-tighten them at an equal rate as ive read that avid discs can warp a little if you tighten them randomly.
    Mark :)
  • Rockhopper
    Rockhopper Posts: 503
    Just check the outer edge of the disk for shiny spots as well.
  • aphex2k
    aphex2k Posts: 3,229
    Prob fixed. Just moved 2 washers around so the caliper is a fraction higher and there's not any rub now.
    Mark :)

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