thicker sprocket nut worth a check

[Adam2201]

I put the thicker sprocket nut on mine not long after I bought it in 2015, having read through all the woes on here. The old 9mm nut was still on foccing tight when I took it off, no sign of any issues.


Came to change my chain and sprockets yesterday and when I bent back the lockwasher the nut was loose!  I don't think it would drop off mine due to being the older model with the thicker sprocket cover, but it's annoying to find it like that after replacing the nut.  Can't see any damage to threads, so I'm really not sure what's happened - I read through a few posts on here when I fitted it and torqued down to 80nm dry, so will try 90 with threadlocker this time and keep a better eye on it this time.


Bonus picture of old vs new sprocket just to shame myself - as you can see the old one is an advanced model with special bent teeth for chain retention  [size=78%].  Surprisingly, chain was still within spec when I measured it properly, and didn't seem to pull off the back sprockets excessively.[/size]
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[smg id=2953 type=preview align=center caption="20170317 233943"]