The Steps RT-EM910 E-Bike disc rotor from Shimano with Center-lock mount, ICE-TECH FREEZA technology and integrated magnet.

SHIMANO RT-EM910 disc brake rotors for speed sensor systems deliver powerful and consistent brake performance in all riding conditions. The ICE TECHNOLOGIES FREEZA rotor significantly reduces heat build-up in the brake system to ensure consistent high performance braking even on the steepest downhill stretches. SHIMANO's CENTER LOCK mounting system makes installing and removing rotors quick and easy thanks to the spine mount and lock ring design.