• Cassette doesn't make any difference in Shimano/Sram land.
    8=8
    9=9
    10=10
    11=11

    Shifter to rear mech is where you need to check. MTB 10s = dynasys, so nothing from road world will work with it. Road 10s = could be one of several pull ratio.

    If you have a dynasys 10s MTB flat bar shifter then you'll need a dynasys 10s MTB rear mech. Loads to choose from.

  • Cheers. Looking to change cassette sizing, not the mech.
    MTB 42 t doesn't have a place on a commuter

  • All you'll need to worry about is going below a 34t and it being for 11 speed road spaced freehubs only when your freehub for a big ol' MTB cassette is probably 8/9/10.

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