With a unique four-arm spider and Hollowtech II construction putting strength just where its needed the FC-R9100 chain-set sets new standards for stiffness and low weight.
Features Include:
- 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
- 50-34T/53-39T/54-42T/55-42T/52-36T
- Iconic design
Note: 177.5 & 180mm Chainring sizes are offered in 34-50t, 39-53t, Crankset install tool is not included.
Dura-Ace delivers concentration control and confidence with slick fast accurate performance that you can depend upon without distraction. Dura-Ace now has an 11-speed cassette with numerous gearing options to cover all situations.
Leading edge design materials and construction reduce weight improve stiffness and enhance control.
Your chainset must fit onto your bottom bracket! There are currently four chainset/bottom bracket interfaces that you're likely to come across. If your bottom bracket is made by Shimano and it has splines then you need an Octalink chainset. If your b/b is NOT made by Shimano and it has splines it's almost certainly ISIS. There are a very few non-Shimano chainsets with Shimano Octalink interfaces so to be sure count the splines - ISIS has 9 Octalink has (surprise surprise) 8. No matter which brand of b/b you have if it has a square interface it will require a traditional square taper chainset. If you have one of the new Hollowtech II systems you will need to choose the exact chainset that matches your bottom bracket. Most MTB chainsets are now 9-speed compatible but these will work with an 8-speed system.
