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If you are looking for a large collection of mini bike brake drums all sourced from leading brands and good as OEM replacements, check the stocks at OMB Warehouse. The mini bike brake drums in our inventory 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 vehicle. This friction generates substantial heat. One of our top selling items in mini bike brake drums is the Band Brake & 4" Drum & Pin fits for Mini Bike ATV. Specifications are 4" brake band and 4" drum. The brake drum is pre-drilled with both 5/16" & 3/8" bolt holes, so you can choose either hole set for mounting. Brake band is about 7/8" thick. The steel brake pin with cable hole has one piece bonded lining brakes. Another in-demand product is the 4.5 Inch brake drum & band kit with 7/8" Wide Band, (3) 5/16" bolt holes on a 3-3/4" bolt circle, (4) 1/4" bolt holes on a 3-3/4" bolt circle, and (4) 9/32" bolt holes on 3.225" Bolt Circle