Shimano RT-EM800 Steps rotor with lockringThe RT-EM800 STePs disc brake has been specially developed for E-Bike use with its ability to increase your brake pad's lifespan, while also decreasing the noise level when braking. Boasting a sandwich style construction of stainless steel and aluminium material, this genuine Shimano disc rotor offers effective heat management when braking for unrivalled performance and reliability. To top it off, it's compatible with both resin and metal brake pads so you can keep your bike running smoothly, whatever your set-up.Features: Material: Aluminium and Stainless Steel Mount: Center lock Compatibility: Shimano STePS RT-EM800 / E6000 Series Included: X1 brake disc including lockring Genuine Shimano parts Average Weight: 129g (160 mm); 150g (180mm)Buy Shimano Components from Chain Reaction Cycles, the World's Largest Online Bike Store.