The Shimano Ultegra CN-6701 Chainhas plate shaping that mirrors the more expensive 7901 Dura-Ace Chain, therefore the performance is, for all practical purposes, identical. You'll get the same crisp lightning-fast shifts thanks to Shimano's asymmetrical design. Here's how the Ultegra differs from the Dura-Ace -- weight and finish. Rather than having perforated inner and outer plates, only the inner plates on this mountian bike chainhave been relieved of excess material. The link pins are also solid where the Dura-Ace chain uses lighter hollow pins. These differences account for the 15g difference between the chains. This Ultegra level chain also lacks the nickel plated inner links...
Best Price: £34.99 from Leisure Lakes Bikes