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I'm still fixing up my son's bike.
I couldn't get the rear mech to shift properly - it just wouldn't drop into the smallest sprocket even with the cable completely disconnected.
Putting on a 105 5700 10 speed rear mech lying around in the drawer-of-parts-that-might-one-day-be-useful, it shifts flawlessly - but there's a nasty rubbing noise.
No, I haven't managed to loop the chain over the bit of metal between the plates.
I _think_ that the 8 speed chain is just two wide for the plates. Does that seem plausible?
Would a 9 speed chain fix this? Or just order a new 8 speed rear mech?
Does that seem plausible?
It wouldn't surprise me
I found a 9 speed XT rear mech in the same drawer; it works perfectly (*).
(*) The chain was a bit too long before, now it's about right, but if the rear cassette is ever replaced by something with a wider range it will need lengthening.