Dura-Ace FC-R9100 Crankset Bags Originally designed in 1938 for

Originally designed in 1938 for heavy duty cycling

Designed to be paired with the FC-M8000 crankset

which allows for relief shifts by either pull of the index finger or push of the thumb

eliminating contact points which cause discomfort for some riders

ideal for winter riding or salty environments

Dura-Ace FC-R9100 Crankset Bags Originally designed in 1938 forThe choice of the world's best climbers, sprinters, and time trial aficionados, the DURA ACE R9100 crank drops weight while maximizing power transfer. The new design, and its iconic look, are adapted for race specific disc brake systems while still offering a wide range of gearing and crank arm length options. 172. 5mm, 52 36T Specs Q Factor: 146mm Threaded BB shell width: 68 70mm Gear front: 2 speed Gear rear: 11 speed Construction: Hollowtech II