Renthal Twinwall Handlebars Product Description/Specifications Renthal's revlutionary handlebar is a large diameter, 1 1/8" (28.6mm) handlebar which utilises two tubes, one within the other, borrowing principles from aircraft design to give the best combination of lightness, strength and safety. Since their release in 1998, the Twinwall has been the handlebar of choice for more professional race teams and has helped more riders win championships than any other handlebar in the world. - Outer tube has extreme resistance to mechanical damage and is anodised to prevent corrosion - Inner tube is ultra high strength and is hard anodised to resist wear from the throttle - Renthal's copyrighted, bonded lightweight, single bolt clamp and brace systems increases .