deragliatore anteriore shimano dura ace di2 r9250 2x12v doppia down swing a saldareThe fastest, and today it is even faster, thanks to DURA ACE FD R9250. Weighing less than 100 grams, the new model is 45% faster than Shimano's FD R9150, which was already the fastest on the market. The front surface of the FD R9250 model has also been reduced to decrease aerodynamic drag. Chainring shifting faster than ever, 45% faster than FD R9150 Smaller, more aerodynamic, lighter Front area reduced by 33% Weight reduced to 96 g Maximum chainring