RT56 (Deore) 6 Bolt Disc Brake Rotor Shimano RT56 (Deore) 6 Bolt Disc Brake Rotor; provides excellent performance using the 6 bolt mounting system Precision cut stainless steel braking surface for cooling & mud clearing properties Ideally suited to Shimano Zee & SLX disc brake systems when using 6-bolt, non-centre-lock hubs