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Crank arm length: 165, 167.5, 170, 172.5, 175, 177.5, 180mm
Rider tuned gearing options
4-arm construction crankset
New designed crank arm
Iconic design
Redesign the gear teeth profile to fit wider gear pitch
HOLLOWGLIDE
Best balance for lighter weight (-7g) and efficiency
50-34T/53-39T/54-42T/55-42T/52-36T
Shorter length of rear center with O.L.D.135mm
Gear combination: 50-34T, 52-36T, 53-39T, 54-42T, 55-42T
Optimum power transfer
Adapted for race specific disc brake system
Maintains high rigidity and reduces weight
Specifications
| OUTER RING MATERIAL | Aluminum/CFRP |
| AVERAGE WEIGHT | 609g,-,621g |
| THREADED BB SHELL WIDTH | 68,70 |
| CRANK ARM FINISH | Anodized |
| COMPATIBLE BB TYPE | Outboard |
| GEAR ARMS | 4 |
| COMPATIBLE CHAIN | HG-EV|11|Speed/|HG-X11 |
| SERIES | Dura-Ace |
| INNER RING MATERIAL | Aluminum |
| GENERATION | R9100 |
| CRANK ARM LENGTH | 165,167.5,170,172.5,175,177.5,180 |
| CHAIN RING COMBINATION | 50-34,52-36,53-39 |
| CRANK ARM MATERIAL | Aluminum |