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Is there any reason why a one up 42t wouldn't work with 9spd? Specifically with an slx 11-34 cassette?
It might work but it would be ****ing hard work around Chopwell 😉
Not the 42t at the rear, though. It's too go with the works 32t up front. 😉
Ah I see,
I messed up and bought the 34, they were sold out of 30's and 32's when i got mine. I have ordered a better set of legs and lungs.
Don't think it'll work with an SLX Cassette at all
Would be a little surprised if the spacing works right- presumably the One Up is the thickness of one sprocket + one gap between sprockets? Which is different for 9 and 10. I reckon it could be persuaded to go though, if maybe not perfectly.
Does seem that by the time you've done that, you probably might as well have swapped to 10-speed, the clutch mech is worth having too for a 1x setup so lots of mutual benefits.
this thread with some home made solutions might interest you.
http://singletrackmag.com/forum/topic/xt-11-42-cassette-for-free/page/2