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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 For 28.6mm or 31.8mm clamp size use SH-FD7800. For 34.9mm clamp with derailleur use SH-FD7800V.