Shimano rear derailleur xtr rd m9100 sgs 11 12 speed

it s tight and precise designed to withstand full force pedalling on the roughest trails while shifting gears as smooth as ever our best chain stability yet though we do expect to drop some stokage on you from its performance features model rd m9100 sgs optimized for new drive system 10 45t 12 speed 10 45t 11 speed decreased rear derailleur tension at low gear position to prevent high chain tension at low gear add bumper at rear derailleur pulley cage bigger 13t pulley 10 51t 12 speed weight 240g benefit enhance shifting performance silent drivetrain low profile design low sprocket combination ...