Aluminum 2-speed holder bulkhead is separate from rear bulkheads to provide appropriate flex and optimum traction. The bulkheads have another mounting position ââ¬â 3 screws in place of 2 ââ¬â even for greater reinforcement regarding the rear layshaft area and enhanced on-power security. The ball-bearing is installed in a composite bushing to get rid of vibration from motor. The master is CNC-machined from premium Swiss 7075 T6 aluminum to ensure the lightest & strongest help framework the 2-speed. Ebony color.