Dura Ace FD-R9250HLC. Web. Services. CmsService. Models. Pages. CmsPageProductDetails The fastest just got faster thanks to the DURA ACE FD R9250 Di2 electronic front derailleur. Tipping the scales under 100 grams, the new design shifts 45% quicker than Shimano's FD R9150, already the fastest on the market. The frontal area of the FD R9250 is also reduced, decreasing aerodynamic drag. 45% faster shifting than FD R9150 Frontal area reduced by 33% Weight cut to 96 g Top