Dura-Ace FC-R9100 Crankset Size:172.5mm The SELECT series focuses on

The SELECT series focuses on the perfect combination of performance

Superior Shaping | Composed of 32% Lycra

J4 Brackets for an adjustable extension and armrest position

and then remove it for hitting the trails

Durable stainless steel body plate reduces flex and pedal body wear

Dura-Ace FC-R9100 Crankset Size:172.5mm The SELECT series focuses onThe 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