4" Thru 4-1/2" Drums and Drum Brakes

Check out the wide range of mini bike 4 in thru 4 ½ in drums and drum brakes at OMB Warehouse, all good as OEM replacement parts sourced from leading brands. Drum brakes are generally made of a special type of cast iron that is heat-conductive and wear-resistant. It rotates with the wheel and axle. When a rider applies the brakes, the lining pushes radially against the inner surface of the drum, and the ensuing friction slows or stops rotation of the wheel and axle, and thus the mini bike. This friction generates substantial heat. Check out our 4-1/2" Brake Drum with Flange It has a standard 6 bolt pattern for our split aluminum sprockets. Universal bolt pattern fits our Tri-Star wheels. The three bolt patterns are as follows:3 holes (5/16") on a 3.75" Bolt Circle, 4 holes (1/4") on a 3.75" Bolt Circle, 4 holes (1/4") on a 3.228" Bolt Circle (these holes are a bit differently spaced to accommodate the four holes on the mini-hubs). Another of our mini bike 4 in thru 4 ½ in drums and drum brakes has a #35 sprocket factory riveted in position ready to accept our 4-1/2" internal expanding brake assemblies.