Renthal 999 Twinwall Handlebar Titanium BIRMINGHAM SMALL ARMS (BSA) MARTINI INTERNATIONAL MKII Z67232. The Renthal Twinwall motocross handlebar features a patented tube within a tube design borrowed from aircraft design principles to achieve the highest strength possible in a moto handlebar. Twinwall's superior design construction allows it to withstand the hardest hits and biggest get offs without compromise, making it a popular choice to for championship contending athletes worldwide. Since its introduction in 1998, the Twinwall handlebar has helped more riders win championships than any other handlebar in the world. DESIGN The Twinwall consists of two aluminium alloy tubes, one within the other. This design gives the handlebar additional strength and security, making Twinwall the toughest handlebar available. TESTING Testing plays an important role during the development and production of each Renthal Handlebar. MANUFACTURE Manufactured exclusively within the Renthal Factory by Renthal manufacturing employees. The Twinwall undergoes a 29 step process that sees raw tubing come in and finished handlebars leave the factory. TESTING Testing plays an important role during the development and production of each Renthal Handlebar. RACING Renthal and Racing go hand in hand. Renthal is proud to be in the hands of every racer, from 50cc mini riders to World Champions. Dimensions: Width Dim A: 813 mm Height Dim B: 79 mm Rise Dim C: 42 mm Clamping Width Dim D: 125 mm Sweep Dim E: 54 mm Control Length Dim F: 200 mm Dim G: (Not specified) Height Dim Bv: 79 mm Mounting Diameter: 28. 6 mm 1+1 8"