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Pretty sure it’s a different cable pull ratio. You’d need a friction shifter to get it to work with a 10spd cassette.
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I can confirm you shouldn't be so presumptive. Shimano 5-9 speed "works" across MTB and road, 10 and above won't work across the MTB/road divide or between speeds (except 4700 tiagra and 10 speed GRX which works with 11 speed shifters or their specific 10s) there's a bit of MTB muddling between 10 and 11 with some of the newer deore mechs, 12 is different too. Cues stuff is all different to the rest but the same as itself across speeds.
AlexD
snottyotter
@skullandbiscuits
Deore XT M739 rear derailleur, presumption is all shimano 8speed will work with 10 speed? Can anyone confirm?
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