Features: The disc brake for rotor floating systems is designed to not only dissipate heat effectively, the bike remain stable even at high speeds, but also provides powerful braking for force, a safe ride. The bike disc brake Rotor is make of Aluminum alloy bracket, with high strength, not easily to deforms, and excellent rusts prevention and wear resistance. Stainless steel floating buckles keep the outer disc from locking directly to the hub, leaving room for thermal expansion and helping the rotor stay flatter during heavy braking. The wide aluminum cores supports the steel rings, which lowers the chance of rotor warping after long descents or repeated hard braking, keeping braking performances more stable. Perfectly fit for your mountain bike, road bike, electric bike, fat bike, folding bike, more. Specifications: Component: Aluminum Alloy Bracket Type: 140mm/160mm/180mm/203mm 140mm Size: about 14x14x1cm/5.51x5.51x0.39inch 160mm Size: about 16x16x1cm/6.3x6.30x0.39inch 180mm Size: about 18x18x1cm/7.09x7.09x0.39inch 203mm Size: about 20.3x20.3x1cm/7.99x7.99x0.39inch Package Includes: 1pc Bike Disc Brake Rotor note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.