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.


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


Chain line (mm) 43.5
Compatible chain
HG-EV 11-speed, HG-X11
Crank fixing bolt included No
Gear arms 4
HollowGlide Yes
HollowTech Technology Yes
B.C.D. (mm) 110
Rear Speeds 11


34 teeth (for use with 50 teeth)
· Type: MS

36 teeth (for use with 52 teeth)
· Type: MT

39 teeth (for use with 53 teeth)
· Type: MW

42 teeth (for use with 54 or 55 teeth)
· Type: MX

50 teeth (for use with 34 teeth)
· Type: MS

52 teeth (for use with 36 teeth)
· Type: MT

53 teeth (for use with 39 teeth)
· Type: MW

54 teeth (for use with 42 teeth)
· Type: MX

55 teeth (for use with 42 teeth)
· Type: MX

Note: To guarantee best shifting performance, you may only combine chainrings of the same type, e.g. MS with MS

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