B+CASSETTE+CHAIN+BRAKE(OPTIONAL). The original MTB group continues its legacy of remaining the standard for mountainbikers everywhere. Shimano XT 12-Speed Cassette CS-M8200 51T(M8100 upgraded). Shimano Deore XT 1X12-Speed Crank FC-M8100-1 30T/32T/34/36T, 165MM/170MM/175MM.
