Features: The bike disc brake Rotor is make of SUS410, with high strength, not easily to deforms, and excellent rusts prevention and wear resistance. The polygonal airflows designs and large hole spacing provide good heat dissipation performances and reduce brake attenuation and warpage, thus ensuring excellent brake performances. Excellent dry and wet performances, good wear resistance, quickly ventilation and good heat dissipation. Used-as front disc brake bike and rear disc brake bike, easily to install. Mountain bike Rotor are available in 5 size of 140/160/180/203/220mm. Specifications: Materials: SUS410 Diameter option: 140mm (5.51inch)/160MM (6.3inch)/180MM (7.09inch)/203MM (7.99inch)/220MM (8.66inch) Note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color. Package includes: 1pc Bike Disc Brake Rotor