Shimano disc hub rear m475a good value disc compatible rear hub with standard six bolt disc rotor fitting ideal for shimano hydraulic or mechanical disc brake systems rubber contact seals help prevent rust causing water and mud reaching hub bearingsfeatures disc rotor mount 6 bolt axle type light alloy quick release complete hub axle 146mm 5 axle material steel steel bearings 18 pieces a 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on