Shimano RT-EM300 Rotor with Internal and External Lockring, 180mm

The Shimano RT-EM300M is a 180mm Center Lock disc brake rotor optimized for e-bikes, typically used on the rear wheel. Its key feature is an integrated magnet that interfaces directly with the Shimano STEPS speed sensor (e.g., SM-DUE11) for reliable speed data and accurate electric assist. It delivers consistent stopping power and is only compatible with resin brake pads.

Please Note: Rear wheel use only 

Included:

• Shimano RT-EM300M 180mm brake rear brake rotor
• Internal/External lock ring
• Speed sensor magnet