I don't understand. You're foregoing a whole gear system....because you want to use a specific derailleur?
yeah, better to trade the SRAM Force 1 to an equivalent shimano mtb I guess.
That's still messy. Can't just chuck an MTB derailleur in there. Cable pull is different. Shimano doesn't do 1:1. Just get something like an M8000 cassette and a roadlink, get rid of FD and double and bob's your uncle.
@Thrust started
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I don't understand. You're foregoing a whole gear system....because you want to use a specific derailleur?