Re: Shift kit and deraileur gears
How long have you been riding on that cassette and chain? I don't know how much extra wear the shift kit places on those components, but I used to tear up cassettes and chains on my human-powered (no engine) mountain bike every 500 miles or so. Just from grit and crap in the chain, I figured.
How often do you clean and lube your chain and sprockets?
I'm definitely curious to hear more about this, since I'm still in the middle of a shift-kit install on my bike right now.