Hi everyone,
I've been running a Wippermann 9 spd. chain on a 3/32 ACS freewheel, which is supposedly made to run an 8 spd. chain. I don't have any problem, no noise, no skipping, but it looks like the chain is wearing down the side faces of the FW teeth (nothing major though, only the finish).

1- Should I ignore this and continue to run a 9 spd chain ?

2- With a SS chain, does it wear down the finish of the teeth ?

Thanks in advance,