disco freno shimano rt em600 center lock ring esternoSHIMANO STEPS CENTER LOCK Disc brake rotor ICE TECHNOLOGIES Speed sensor system 203 180 160 mm The SHIMANO RT EM600 disc brake rotors for speed sensor systems provide consistent and powerful braking on rough mountain bike trails. The robust and durable ICE TECHNOLOGIES rotors significantly reduce heat buildup inside the braking system to ensure high and consistent braking performance even on the steepest downhill sections. SHIMANO's CENTER LOCK