Shimano RT-EM300 Rotor

While the RT-EM300 is specifically engineered for the higher torque and speed sensor requirements of e-bikes, it functions as a standard Center Lock disc rotor and will work on non-electric bikes that utilize the Center Lock mounting system.

Because this rotor uses the Center Lock system, you will need a standard external bottom bracket tool or a cassette lockring tool to tighten the included lock ring.

Yes. The included lock ring features both internal and external serrations, which ensures compatibility with various axle standards, including both thru-axle and quick-release setups.

E-bikes are generally heavier and generate more torque than traditional bicycles, which puts extra stress on the braking system. This rotor is built with reinforced construction to handle that increased heat and mechanical load, ensuring consistent stopping power.

This rotor is compatible with resin brake pads. If you are using metallic or sintered pads, check your specific brake caliper manufacturer's recommendations, as some rotors are optimized specifically for resin compounds.