The XTR M9100 12 Speed Cassette has been created with an increased transmission ratio, is 30% stiffer than previous models & keeps a lower weight to maximise efficiency when making those vital shifts. Equipped with a 10-45 or 10-51 teeth system, cadence jumps when moving between gears are kept low to maintain high-speeds & steady rhythm as you blast through your run. Featuring Hyperglide+ technology, the cassette benefits from small shifting ramps leading the chain to the next sprocket when going up through the gears & on the way back down, stopping the chain from dismounting. This ensures consistent gear-stepping at all times with no impact to your cadence. A fantastic set of sprockets for the thrill-seeking trail & downhill rider, the XTR M9100 12 Speed Cassette is more than equipped for the rowdiest of rides.