I've been having some problems with my chain slipping from my rear cassette under heavy load, and think it may be related to an i-drive maintenance issue. Hopefully one of you i-drive experts out there can provide some help for me- the LBS hasn't been too much help on this one.
I have this bike: BikePedia - 2004 GT I-Drive 1.0 Complete Bicycle and have been experiencing an annoying chain slip on the rear cassette when apply a really strong pedal stroke in certain gears (like if I am trying to "power over" something- so not related to shifting). I've had the bike for a while, but was not an issue in the past. I have replaced the cassette (sram mid-level 9sp), chain(sram mid-level 9-sp), crank (race face- mid level), derailleur (lx m580), hanger, and cables/housing and this problem still persists. I think I have the bike pretty well dialed in, so I don't believe it's slipping due to the derailleur being out of line, especially as I've adjusted it slightly off from perfect to make sure that isn't the issue. At this point, I have narrowed it down to the following in my own mind, but I'm not a bike mechanic, so I could be missing something obvious.
1. Perhaps something to do with the "b-tension" screw on the derailleur- when following the tuning instructions, it isn't clear to me where this should be set.
2. Perhaps my chain is too slack? I followed the instructions for the derailleur (on both large sprockets- add 2 links).
3. Lastly, I was thinking it may have something to do with my i-drive. There is quite a bit of play rotationally (0.5 cm or so) when I jiggle the eccentric body (the aluminum thing just inside the frame on the non-crank side). I can't remember if it was like this when new. Is this typical, or a sign that it needs maintenance, and if so, is it likely that this may be the cause of my chain slip issue?
If anyone has any idea what is going on with my bike, I'd really appreciate it. It's hard to reproduce, as it only happens in certain gears, and in cases of extreme load (not while shifting though), but still, it didn't used to happen, and is extremely annoying when it does.
Thanks in advance for any wisdom you can provide!
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Thread: i-drive chain slip