Another Loose Sprocket Nut

[m3psm]

I've never had or seen a spline wear when the sprocket was securely fixed in place. I think the wear is more likely because the sprocket was moving around on the shaft side to side after the nut came loose.

The teeth on the front sprocket are well worn. The rears hook over like that first with the chain being out of adjustment. This then stretches the chain more and then starts to hook the teeth on the front sprocket.

My rears have hooked and chain is stretching now so need to replace it fairly sharpish because it'll put more strain on the sprocket nut as the chain wont seat properly on the sprocket.

The easiest way to tell if you have hooked sprockets is to roll the bike backwards. If it's past it's best you'll hear a clicking noise where the chain is jumping into place.