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 arm Maintains high rigidity and reduces weight: - HOLLOWGLIDE - 4-arm construction crankset Adapted 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