Probably a daft question, but... I was wondering if it's ok to just get 10 speed shifters, rear mech, cassette and chain, while keeping a 9 speed chainset and front mech?
My understanding is that the internal diameter of the 10sp chain is the same as the 9sp (so it'd be ok on a 9sp chainring), it's just the plates being thinner which results in the external diameter of the chain links being narrower to fit the 10sp cassette spacings.
And would a 9sp front mech shift the chain ok? For that matter, is there a difference in cable pull between a 9sp and 10sp front shifter?! Questions, questions...
Advice appreciated - especially from anyone who's already done this!
Oh yeah - this'd be on Shimano.