High Strength Bike Brake Disk Plate Flange Type Threaded Disc Brake Disc 160MM Diameter Bicycle Parts In recent years, disc brakes have made an emergence into the field of road bike racing. These competitions happen with bikes going at about 80kmph, and there are a lot of safety concerns at such high speeds. - Suitable for Flanged threaded type Disc Brake system for Mountain Bike Bicycles. - Not suitable for 6 holes type Disc Brake System. - Made of High strength Steel, Highly Abrasive. - Outer Diameter of the Disc: 160mm.