MegaSack DRAW - This year's winner is user - rgwb
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Hi
Just wondering if I need to change my chainset if I'm changing from 27 to 30 speed ... or will my current xt770 9 speed cranks & chainrings do the job?
all the other kit ... cassette, chain, rear mech shifters etc are 10 speed
No. Much as the likes of Shimano and SRAM would like us to believe otherwise, there's no detectable difference between a 9sp and 10sp crankset, so you'll be fine.
great news ... so the narrower guage chain runs fine on the 9 speed rings?
I believe the internal diameter of a 10 speed and 9 speed chain is the same, therefore no bother.
great news ... so the narrower guage chain runs fine on the 9 speed rings?
Yes. As Mackem said above, the internal measurements of 9 and 10 speed chains are the same, the plates are slightly thinner on the 10sp that's all.
I was wanting to use a 9sp SLX double on my otherwise 10sp setup (preferred the integrated bash on the old SLX double), but had heard all sorts of opinions about the 10sp teeth being narrower, spacing of rings different, chainline different etc. So, decided to find out for myself, and after half an hour with one of each and a vernier calliper accurate to 0.02mm, concluded there was absolutely no difference!
Experience in use since then has backed this up.
I use steel inner and middle rings from 9 speed Shimano Deore chainsets - absolutely no issues. (steel rings means my drivetrain lasts at least a year even in Peaks grit!)
fantastic
thats to all .. you've saved me a lot of money and hassle
steve