Shimano RT-EM300 Disc Brake Rotor Rotor Size:203MM Supersonic tubes are further optimized

Supersonic tubes are further optimized for even lower weight and rolling resistance due to their thinner material and construction

Enduro Italian threaded bottom bracket with stainless steel bearings

I-Spec II compatibility

28mm max tire size

3mm wall butyl tube

Shimano RT-EM300 Disc Brake Rotor Rotor Size:203MM Supersonic tubes are further optimizedSHIMANO RT EM300 disc brake rotors for speed sensor systems provide exceptional stopping power in all riding conditions. Shimano's CENTER LOCK mounting system makes installing and removing rotors quick and easy thanks to the spine mount and lock ring design. Rotor Size (mm) 180, 203 Hub Disc Compatibility Center Lock