What began in 1961 with the presentation of the first three-speed hub gear is now an integral part of the bicycle industry: groupsets from industry giant Shimano. Whether for mountain bike or racing bike, the Japanese giant has every base covered. The Dura-Ace series groupset is the jewel in the crown of Shimano's racing bike groupset range, featuring groundbreaking technology and aerodynamic design that is well-known for pushing envelope when it comes to braking and shifting componentry. With its extremely low weight, perfect ergonomics and maximum functionality, Dura-Ace is designed for ambitious and professional cyclists. In addition to the classic mechanical version, the series is also available with Shimano's  Di2 electronic shifting technology.