Rear wheel working loose.

rubberjungle

Coming up my drive today which is steeply uphill so I was in a low gear out of the saddle my rear brakes (rim Brakes) suddenly locked on.
The wheel had shifted slightly and upon releasing the QR it sat back in the correct position.
I tightened the skewer slightly more but it still does it under heavy load.
I went to my LBS and they sold me a new skewer as they thought the old one was too smooth on the mating surface but even after fitting it slightly tighter again it still does it.
I have checked the rear dropouts and they have a nice slightly roughened grip surface and the nuts on the wheel axle (Mavic Crossride) have a criss cross hatch pattern too for grip.

I am stumped. Any ideas apart from monkeying up the QR so tight it may damage the bearings?

nicklouse

what is the bike?

how is it moving in the drop outs?

and how are you using the QR?

rubberjungle

Hi,

The bike is a Sp Hardrock about ten years old in pretty good nick.

The drive side is lifting up under torque by 5-10mm untill it is prevented from going further by the brakes rubbing, but only under v high load, not on level on road riding.

I set the QR so it starts to grip at 90 deg then fold it flat, the LBS tried it and thought it was the correct tightness.

I guess it can only be caused by a lack of grip between QR, dropout and wheel nut.
The surface on the dropout does now show witness marks where the wheel has shifted while the QR was tightened.

Would cuntre punching the dropout mating surface be a good idea to increase friction or is there a better idea out there?

nicklouse

so the bike has vertical drop outs?
the hub/wheel sound like they are dead.
if the axle is seated in the dropouts correctly how can it move?

Maybe the frame is cracked!