Shimano RT-EM600 Brake Rotor - OE Packaged Advanced braking for the most advanced e-bike systems The Shimano RT-EM600 Brake Rotor brings Shimano's world-class braking and rotor technology to the world of e-bikes, with a robust, heat-dissipating design, and e-bike features to provide consistent braking power for the most advanced e-bikes. The EM-600 Rotor incorporates Shimano's Ice Tech construction, significantly reducing heat buildup under the heavy braking loads commonly found with e-bike use. The rotor also features an e-bike magnet built into the rotor, ideal for use as a rear rotor to provide speed to the bike's speed sensor. Features Sold as OE (original equipment) and does not include Shimano-branded packaging Ice Tech technology combines outer steel brake tracks with an aluminum core for increased heat dissipation E-bike sensor magnet built-in for use as a rear rotor on compatible e-bike systems Specifications Rotor Mount Centerlock Rotor Technology Ice Tech | Shimano | Rt-Em600 Brake Rotor - Oe Packaged 203Mm X 1. 8Mm, W/ Lockring, E-Bike Magnet