Shimano deore rt56 6 bolt disc rotorshimano rt56 rotors offer great value and performance using the 6 bolt mounting system features mounting system 6 bolt for use with resin pads onlynb does not include fixing washera 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on dura ace and xtr products buyshimano componentsfrom chain reaction cycles the worlds largest online bike store