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Braze on with Clamp 34.8mmMore 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 28.6 or 31.8 clamp size us SH-FD7800. For Braze on use item SH-FD7800B.