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Does anyone know if one can fit a 22t inner ring to a 38/24 XT chainset? Is it too much of a leap for the mechs (also XT)?
Yes it'll fit, any 64 BCD ring will.
However, I think you're shifting will be 'sub-optimal' in a couple of areas. First, changing up is a big gap, and you may have to accept a bit of rattle-rattle-clunk. Second, on changing down from the 38, the ramps will send the chain off at the angle where its expecting to find a 24 ring. The 22 will, however, be lower, so the chain may occasionally overshoot the granny ring and end up on the BB shell. I had this when I used similarly mis-matched chainrings - in my case a 36T designed to work with a 24T and I paired it with a 22T instead, but the principle is the same.
Last, I have a 24/38 XT setup, and the chain already rubs on the bottom of the cage when in the smallest 2/3 sprockets on the back, so with a 22 granny ring this is likely to extend to the smallest 4/5.
So in summary, it'll work, but the shifting won't be perfect.
Wow, definitive answer if ever there was one! So I suppose if one were to change the 38 for a 36 it should be fine.
Any idea if there's a noticeable difference between 24 front, 36 rear and 22 front 34 rear?
So I suppose if one were to change the 38 for a 36 it should be fine.
That would certainly solve most of the problems, so long as they were a properly matched 'pair' of rings, such as the M665 36/22 rings.
Any idea if there's a noticeable difference between 24 front, 36 rear and 22 front 34 rear?
24x36 is 17.3 gear inches, and 22x34 is 16.8 gear inches, so they are pretty much the same.