body p { font-family: Arial, Helvetica, sans-serif;}Shimano"s Ultegra series is "pro-proven" as it is a direct trickle down from their Dura Ace group. It stands for state-of-the-art technology, proven in pro races, the technology used in the new Ultegra 6800 series with 11 speed, newly designed brakes, new chain treatment etc.HollowTech II integrated bottom bracket uses a wider bearing placement and larger axle diameter for increased stiffness and efficiency.HollowTech II integrated bottom bracket seal design has minimal bearing interface ensuring smooth rolling and increased durability.The perfect replacement bottom bracket, and an even better upgrade.Easily fitted using a HollowTech II Tool.Compatible with all Shimano Hollowtech II road cranks.New sealing system reduced drag by 50%.Available in English 68mm Shell or Italian 70mm shell thread. Who are Shimano?Shimano are the world leaders in bike part manufacture and first established themselves as a family business in 1921 in Japan, going on to create the worlds first bicycle freewheel. Shimano are responsible for some of the world"s best drivetrains, wheels, pedals, shoes, cycling clothing, to name but a few of the many shimano products available today! Famous for their top end products ridden by the pro"s, Dura-Ace and XTR, which cover both road and Mountain bikes and are used by some of the top professional riders in a variety of riding disciplines. Shimano value the world we live in and have a strong environmental ethic, ensuring that the parts you buy have had the least impact on the environment. Shimano consistently continue to make the best products for each area of cycling; whether that be Road riding to downhill racing, they know the market better than any other company and as a result make some of the most precise and high quality parts available on the market today. In their 87 plus years of existence Shimano have accumulated a vast knowledge of technology, product development and