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but those last few cogs, 10/11/12th especially change with the grace of a 1" drive impact gun, i.e. CHU CLUNK
So much this. It's strange that this is never mentioned in any reviews.
I ran 11 speed xt on mtb for years before I bought an eagle groupset,the xt was faultless really, nice crisp shifts every time.
The clunkyness of the downshifts on the eagle groupset drove me nuts, it was so fucking loud. Daring to pedal hard while shifting up made frightening noises. I thought it was some sort of set up error I was making before realising thats just how sram eagle is.
The answer turned out to be a shimano chain and cassette.
Probably a tiny little graze on the metal just near a pin/bush/pivot jobby, sometimes really hard to spot and causes it to not return to the bottom every time.
+1 on the upper tier SRAM stuff just being tougher, not used AXS, but always been of the opinion that Shimano's higher tier stuff shifts better in higher gears (9-12th) even when very worn, SRAM cassettes and rear mechs/jockeys last longer until deemed worn enough to affect anything, but those last few cogs, 10/11/12th especially change with the grace of a 1" drive impact gun, i.e. CHU CLUNK
Sram SX is garbage and should never have been made. Number of new bikes (<2 months old) where the rear mech has the same wear as a continuously used 2004 9s deore or XT rear mech, is unreal. NX isn't much better. GX or above ONLY. An actual waste of the earth's resources those cheaper ones.