Shimano XT 6-Bolt Rotors SM-RT76 180mm. The Shimano XT SM-RT76 disc brake rotors utilise the same design as the RT79 centrelock versions, allowing those with 6 bolt hubs to run a matching caliper and disc combo for optimum performance. These brake discs are ideally suited to Shimano Saint, Deore XT and XTR systems, offering additional versitility with minimal weight penalty. THe rotors feature a precision cut stainless steel braking surface which improves pad clearing in muddy conditions while aiding cooling under high load, increasing pad performance and life. The large forged alloy spider supports the rotor braking surface, increasing rigidity and reducing weight. Available in a range of sizes to suit all riding styles and braking requirements, please select from options. All rotor sizes come complete with mounting hardware. Weight (160mm): 138g NB: Image for illustration purposes only – supplied as single rotor only.