Originally Posted by
HillRider
Why is the smallest cog "unusable"? Is it so close to the dropout face the chain won't clear? If that's the problem, a 1mm or 2mm spacer added inside the drive side locknut may be the cure.
Yes, a spacer fixed that problem. It's just that the chainline to the smallest cog is too angled, even from the big chainring. I get slippage as soon as I apply torque, and the cog itself shows now wear.