I recently installed an 10 speed XT 11-36T cassette, XTR SG Rear Derailleur, and XTR 980 10 speed Shifters on my bike. I opted to stick with the 9speed front derailleur and crankset, though am planning on swapping out the chain rings to a 24 or 26T on the Granny and a 36, 38 or 39 in the middle and possibly loosing the big ring- My goal being to loose the "granny" feeling and have two more useable front rings for my trails and ride style- as I only use the 22T in the two largest cogs and quickly shift back into the middle ring-
I only have one ride on it and it functions great, actually a more positive shift feeling from the 970 series XTR- BUT when running in the middle 32T ring and the 36T big cog on the cassette I could hear the chain fighting the chainline- which was not the case when I had the 9 speed rear 11-34t cassette. Both the 970 and 980 3 ring cranksets have a chainline of 50mm (the 2X reduces slightly to 48.8) so nothing changed up front. To me the 36T on the cassette mated to the center ring is truly a "money" gear as it makes a 1X10 even more usefull...
I have not been able to confirm it but I have heard rumor that the big cog on the 10spd cassettes is pushed in slightly toward the hub, which would do it- has anyone else noticed this? or can anyone shed some light on it?
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