Get medium cage anyway for when you want more than a 28t
I've been slogging up hills with 40/26 for a couple of years, 34/28 will be a dream.
Offroad=mud=low gears
I would get it just incase, it will still work fine with 28t, but saves you needing to buy another mech if/when you want a bigger cassette
@umop3pisdn started
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Get medium cage anyway for when you want more than a 28t