Product DescriptionThis kit is for use on 7/8″ handlebars. This kit is a direct fit the DB30 series bikes that have the rear disc brake only. Can also be adapted to some Motovox minibikes with a rear disc brake.This can be adapted to other minibikes/go karts, but brackets will need to be fabricated. Master cylinder is filled with fluid, but may need to be bled before use. The hose is 48″ long.When mounting on DB30 minibikes with disc brakes, you must ensure the rotor is centered in the caliper for proper operation. Due to manufacturing tolerances in these minibikes, you may need to shim the caliper to achieve the proper alignment