Kustom Tech Mini Front Drum Brake Kit Radical retro styled mini front drum brake kit, style matching the Kustom Tech rear drum brake. Complete kit available for all hydraulic Showa forks and Springer forks with 3/4" axles. This mini-sized drum is made from cast iron, the best material for maximum efficiency in a drum brake. With fins in the center that will aid cooling. The sides are aluminum. It is drilled for use with 40-spoke rims and is equipped with 3/4" (19.05mm) inside diameter axle bearings. Dimensions: 3-5/16" (84.1mm) wide x 5-1/2" (139.7mm) diameter The Springer model comes with a special bearing like inserts (shoe plates) allowing you to torque down the wheel axle but still allowing the drum to rotate/move with the rocking suspension movement of the Springer fork