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More rigid for faster shifting under higher loads. The new Dura Ace front derailleur boasts wider and reinforced pivots and a super-strong cage. Narrower cage to accommodate the new Shimano 10-speed chain. 75 g Specify 28.6 or 31.8 clamp size. For Braze on use item SH-FD7800B. For 34.9 clamp with derailuer use SH-FD7800V.