• would I need a long cage mech?

    Mid cage MTB RD is the way to go for SRAM 10-speed. You only need the long cage for triples. Might even get away with short cage if you're not going full dinner plate on the big sprocket.

  • You get nice stuff like cagelock, type2 and a less goofy cable entry point. And a mid-size cage, whereas I think the wifli ones are long or nothing.

    That said, the wifli ones are a straight swap, whereas with mtb you'll need to trip your cables and housing down, and you lose a barrel adjuster.

  • Why MTB over the road wifli ones?

    What he said, plus the 36T sprocket option because why not? Compared with the old 6-speed touring blocks, which were fine, the jumps on a 12-36 10-speed are smaller on the middle 6 and you get 2 extra gears at each end

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