Aluminum 2-speed owner bulkhead is split from back bulkheads to provide appropriate flex and optimum traction. The bulkheads have in fact another mounting destination ââ¬â 3 screws instead of 2 ââ¬â additionally for greater reinforcement concerning the back layshaft area and improved on-power safety. The ball-bearing is established in a composite bushing to eliminate vibration from engine. The master is CNC-machined from premium Swiss 7075 T6 aluminum to ensure the lightest & strongest support framework the 2-speed. Ebony color.