ZTTO Bike Centerlock Disc Brake Rotor Stainless Steel Bicycle Rotor with Lockring for MTB Mountain Road Bike Features: Stainless steel brake rotor, high strength, strong and wear-resistant, not easy to rust. Center lock design, with lockring, stable installation, effectively improve braking performance. Hollow design greatly reduces the weight of the rotor and has a nice heat dissipation effect. Easy to install and use, perfect for MTB, mountain bikes, road bikes, etc. Specifications: Color: Silver Material: Stainless Steel Diameter: 140mm/ 160mm/ 180mm/ 203mm(optional) Thickness: 1.8mm Weight: 140mm: 163g/ 5.7oz              160mm: 183g/ 6.5oz              180mm: 205g/ 7.2oz               203mm: 251g/ 8.9oz Packing List: 1 * Disc Brake Rotor