(3) With over 35 years of service on the Pro scene Dura-Ace has always been about absolute performance, precision engineering & advanced technology. None of this has been compromised for the new 7900 series, a new benchmark in bicycle components is about to be set. The Shimano Dura-Ace 7900 Hollow Tech II Double Chainset offers the optimum balance of light weight & rigidity, making it the global choice for road racing's elite riders.