Originally Posted by
Velocivixen
Is the cassette you installed the same general sprocket size? Wonder if the guide pulley is rubbing on the bottom edge of the cogs? I'm definitely no expert but just a thought you could check.
The old cassette was sram 12-25. The new one is ultegra 11-23. I looked again and there's plenty of cleareance between the pullys and the cogs. after testing it again its most noticeable when I'm in the 52t and 11t / 12t
Originally Posted by
Retro Grouch
That was my first thought too.
My second thought has to do with the chain. Did the OP install a fresh chain to go with his new cassette? A worn chain on a new cassette might do that.
Its not a fresh chain but not exactly old. According to the chain wear indicator tool I have the chain doesnt need to be replaced.