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If I fasten my rear qr any tighter than 'just enough to keep it closed ' (which is nothing like tight to be honest) the wheel binds badly. So bad that a decent shove of the wheel with the bike off the ground would have the wheel spin twice at most.
I've realigned the disc calliper so it's not rubbing at all. If I unfasten the qr completely (bike upside down) it will spin for ages from the same (unscientific) shove.
Qr itself seems fine. Straight and not binding on it's cam at all.
Any ideas?
what hub is it?
Sram x9. 135mm. 6 bolt disc. Frame is Cannondale alloy. Doesn't appear to be cracked or anything.
EDIT: not a clue then
Is it a cup and cone hub? It's normal to leave a small amount of play in the hub when you do the cones up, as otherwise the hub binds as you describe when the QR is done up.
http://www.parktool.com/blog/repair-help/hub-overhaul-and-adjustment
hope can do that if they're assembled with spacers in the wrong order following a bearign change but I'm not familiar with SRAM hubs.
Have you changed anythign recently (new cassette, for example?).
Also, check the freehub is seated correctly in the hub body - some rely on the QR to hold them on the axle and if they shift when out of the bike start binding.
Nothing new fitted or changed. Hub isn't cup and cone. Freehub feels fine. Thanks for the suggestions though. I'll have a tinker and see if I can borrow a different wheel to try.
Could it just be that the bearings are shagged and when you loosen the QR the axle is spinning around the QR rather than the bearings around the axle?
I think you've got it spot on. Borrowed wheel was perfect.