Originally Posted by
genejockey
I'd think cable tension first. Check alignment of upper wheel from below.
But WRT chain length, how's the RD look in small/small and big/big, especially the latter?
I’ll grab a pic when I can
Originally Posted by
datlas
Could be worn chainring or cassette.
If all weren’t brand new, that’s what I would have thought too - it’s almost like 1 bad link it skips every 3 or 4 rotations on the crank- and really only hard power