The choice of the world's best climbers, sprinters, and time trialists, the Dura-Ace R9100 chainring drops weight while maximising power transfer.

The new design, and its iconic look, is adapted for race specific disc brake systems.

Features

Best balance for lighter weight (-7g) and efficiency
Maintains high rigidity and reduces weight
Shorter length of rear center with O.L.D.135mm
Optimum power transfer
Iconic design
Adapted for race specific disc brake system
Rider tuned gearing options

Specifications

Chain line (mm) 43.5
Chain ring combination 55-42T, 54-42T, 53-39T, 52-36T, 50-34T
Compatible chain HG-EV 11-speed, HG-X11
Crank fixing bolt included No
Gear arms 4
HollowGlide Yes
HollowTech Technology Yes
P.C.D. (mm) 110
Rear Speeds 11

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