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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.
snottyotter-
Adding to that, excuse me if I repeat everything. Mtb is backwards compatible up to 9-speed. Road is backwards compatible up to 10-speed. Road up to 10-speed is cross-compatible with mtb up to 9-speed. Above there, the shift ratios are different.
Am I also right in saying they altered the 10-speed shift ratio recently, so there’s an additional curveball to watch out for?
Jonny69
Deore XT M739 rear derailleur, presumption is all shimano 8speed will work with 10 speed? Can anyone confirm?