Strange road disc problem
Anyone comes across this please? Any ideas?
Shimano hydraulic disc on front of cx bike with QR.
Position caliper in centre of rotor and after a quick ride is off-centre like the caliper has moved, with one pad rubbing. Bolts are as tight as I dare tighten them.
Wheel is still in place throughout and happens every time.Posted 2 years agomattsccmMember
How do you do the QR up?Posted 2 years ago
I find that if I don’t do it with the weight on the wheels the positioning isn’t always exactly the same. Default now for me is loosen and retighten QR with bike on ground.
Are the QR any good? Cheap external cam ones can move. Try with a decent internal cam one eg Shimano or Campag.
QR is XT.
I tighten QR with bike upside down but then ride it around a bit to make sure in place. Have had that a lot with QR forked mtb as I have to take the wheel off for car every time but with CX can leave the wheel on…so should just be set after one ride…
Not sure what you mean by fork collapsing but setup is identical to previous brakes apart from it’s a different brakePosted 2 years agoscotroutesSubscriberflattyre wrote:
QR is XT.
I tighten QR with bike upside down but then ride it around a bit to make sure in place.
As above, it’s always best to have the wheel on the ground and some weight on it before tightening the QR
Not sure what you mean by fork collapsing
Is the dropout deforming under pressure? Not likely to happen with an alloy insert but could happen with a pure carbon dropout.Posted 2 years ago
Dropout is allow insert but why would it deform differently before and after a ride?
I push the wheel into dropouts as I tighten QR but it can move so will adopt that method from now on. Can’t see how it would keep moving over and over again though if I leave the wheel in place but keep re-centering the caliper…Posted 2 years ago
It’s pretty tight and more than Shimano min torque but worried about over tightening as have stripped thread on rockshox fork in the past.
Will have a good look though to see if nipping up to caliper properly.
I thought it must be caliper moving but then I can’t see why it would move it away from the center anyway? Maybe it’s pushing one piston with more force? Has some air in one side?Posted 2 years agothecaptainMember
Are you 100% sure that the wheel is still properly seated in the dropouts after you’ve ridden it? It could be a slipping QR problem (though I agree it’s hard to see how it can keep on moving further and further if you shift the calliper). Easy to check anyway, undo the QR while leaning on the front and the wheel will either clunk back into place or not.Posted 2 years ago
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