Shimano Dura Ace R9100 Left Crank

The choice of the world´s best climbers, sprinters, and time trialists, the DURA-ACE R9100 crank drops weigh while maximizing power transfer. The new design, and its iconic look, is adapted for race specific disc brake systems while still offering a wide range of gearing and crank arm length options.Features:- Optimum power transfer:- Best balance for lighter weight (-7g) and efficiency- New designed crank armMaintains high rigidity and reduces weight:- HOLLOWGLIDE- 4-arm construction cranksetAdapted for race specific disc brake system:- Shorter length of rear center with O.L.D.135mm- Redesign the gear teeth profile to fit wider gear pitch- Rider tuned gearing options:- Iconic design:Specifications:- Average weight: 650 (55-42T), 642 (54-42T), 626 (53-39T), 624 (52-36T), 614 (50-34T)- HOLLOWTECH II Technology: Yes- Threaded BB shell width_70mm: Yes- Chain line (mm): 43.5- Chain ring combination: 55-42T, 54-42T, 53-39T, 52-36T, 50-34T- Compatible BB type_Outboard: Yes- Compatible chain: HG-EV 11-speed, HG-X11- Crank fixing bolt included: Yes- Crank arm length (mm)_165.0: Yes- Crank arm length (mm)_167.5: Yes- Crank arm length (mm)_170.0: Yes- Crank arm length (mm)_172.5: Yes- Crank arm length (mm)_175.0: Yes- Crank arm length (mm)_177.5: Yes- Crank arm length (mm)_180.0: Yes- Gear arms: 4- HOLLOWGLIDE: Yes- HOLLOWTECH Technology: Yes- Optional chain guard_Without chain / bash guard: Yes- P.C.D. (mm): 110- Rear speeds: 11- Recommended BB_Pressfit: SM-BB92-41B- Recommended BB_Threaded (normal): BB-R9100- Technology: HOLLOWTECH BB | HOLLOWTECH II- Threaded BB shell width_68mm: Yes- Q-factor (mm): 146