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Crossrides under heavy braking?

toastytoasty Posts: 2,598
edited July 2007 in MTB workshop & tech
I fairly recently got some Mavic Crossrides, I've noticed that when I fully pull the brake on and move the wheel forward and back the tire is moving by about an inch. This is with the rotor completely locked. You can literally move it forward and leave it there or move it back. Is this some sort of system to distribute the force?

Sometimes it seems to send big vibrations through the frame as I'm guessing it's shaking the wheel back and forth. My other bikes wheels don't do anything like this.

Both front and back wheels do it which make me think it's intentional, it's just a bit concerning that the vibrating will wear the hubs down.
Stumpy FSR 29er

Posts

  • nicklousenicklouse Posts: 50,675 Lives Here
    what actually is moving? pads in the caliper? rotor on the hub? caliper on the frame?
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  • toastytoasty Posts: 2,598
    It looks like it's the hub is stationary and the spokes are allowing the movement which is why I was a bit concerned. The pressure on them all seems to be contant though.

    They're about a month old now and have been ridden offroad a good few times, I've never really noticed it before. I'm 6"6' though and about 15 stone geared up.
    Stumpy FSR 29er
  • royboy11royboy11 Posts: 71
    yeah check the torque on the rotor bolts. If they aren't tight enough you'll get front-to-back movement similar to if the pads were moving in the caliper.

    If it's side-to-side movement check to see if the play is in the hub. If so it may be time for a new hub or if it's the older cone type it may just need to be tightened.
    Norco Sasquatch '07 - Parts?.. break'em and replace'em
  • royboy11royboy11 Posts: 71
    If you're getting an inch of movement you should have really loose spokes if its caused by lack of spoke tension.
    Norco Sasquatch '07 - Parts?.. break'em and replace'em
  • toastytoasty Posts: 2,598
    Ah ok cheers, I'll make sure they're tight tonight. Obviously 1 inch movement on the tire is a very small rotation on the hub, it could be that the hub is moving very slightly. The Rotor is definitely not moving though.

    Just thought I'd pick peoples brains while bored at work :) Incase it was a fancy system I'd never heard of and Mavic were'nt mentioning on their website.
    Stumpy FSR 29er
  • Mister PaulMister Paul Posts: 719
    Hopefully you'll find it's the rotor bolts. It happened to me a few weeks ago.
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  • toastytoasty Posts: 2,598
    Ah ok cheers. Does sound like that, the movement is a very clean inch or so with a definite start and stop which is why I wondered if it was intended. I guess the bolts could have worked loose since first installed. I really should invest in some good threadlock :)
    Stumpy FSR 29er
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