Identifying Rear Axle Size I've got a bent QR rear axle and am looking for a replacement. Seems that these come in 9.5 and 10 mm sizes with a couple of different threadings. When I measure the OD of the threads I get around 9.8 mm – can I assume that that means I've got a 10 mm axle?

Is the right way to measure to pull the axle and measure an unthreaded section? Or does the size even matter if I'm replacing the cones and nuts with it?
That sounds like 3/8 inch.

Take the hub to a bike shop, they'll be able to pick out a compatible axle for you.