Derailleur tuning--What am I missing?!
I am working on a Dahon Jack city bike-- Drivetrain is SRAM 3.0 Comp 7 sp Grip Shifter, SRAM SX4 rear derailleur and a generic 7 sp cassette. It has a single speed chainring.
So far, I've trued the derailleur hanger, checked frame straightness, installed a new OEM SX4 derailleur and no MATTER WHAT I DO (!!!) I can't get the chain to stop skipping/chattering on the smallest cog.
It works fine on the other 6 speeds, but the small cog is just miserable. (BTW, I've fiddled w/ the shifter barrel adjuster ad nauseum)
Did they not engineer the chain angles into this thing?
What other options am I missing??? I'm ready to throw the thing under a bus!!!