Shimano RT-EM300 Disc Rotor 203mm Oval/Round-Oval That is why these products

That is why these products carry the "Bio" label

Complemented by clever features it is the ideal companion in road traffic

Contains "Carbon Black" (rCB)

and touring bicycles

One piece bolt top cap with 5mm hex socket

Shimano RT-EM300 Disc Rotor 203mm Oval/Round-Oval That is why these productsSHIMANO RT EM300 disc brake rotors for speed sensor systems provide exceptional stopping power in all riding conditions. For use with Resin Organic brake pads only. Shimano's CENTER LOCK mounting system makes installing and removing rotors quick and easy thanks to the spine mount and lock ring design. For use with Resin Organic brake pads only Rotor Size (mm) 203 Hub Disc Compatibility Center Lock Rotor Size 203Mm