Ultegra 12-speed crankset
Shimano Ultegra FC-R8100 Crankset
Ultegra's 2x12 crankset brings Dura-Ace style hollow construction to a more approachable price, with a stiff hollow outer ring and forged hollow arms. A sensible upgrade or replacement for any R8100 build.
Highlights
Why we rate it
HollowGlide outer ring
A hollow-section big ring resists flex under load, keeping front shifts quick and positive even when you shift mid-effort.
Hollow forged arms
Cold-forged Hollowtech II arms keep weight down while delivering the stiffness you would expect from Shimano's second-tier group.
Choice of gearing
Pick 52-36T for fast group rides, 50-34T for general use or 46-36T for steep climbs and rougher roads.
Short lengths available
Arm lengths start at 160mm, which helps smaller riders and anyone running a more aggressive position.
Shared standards
Uses the same 24mm Hollowtech II axle and 110mm asymmetric BCD as Dura-Ace, so bottom brackets and many spares are interchangeable.
Tech specs
Specification
Manufacturer specification. Details may change without notice.
Specification
- Model code
- FC-R8100
- Series
- Ultegra R8100
- Speeds
- 2x12
- Chainrings
- 50-34T, 52-36T, 46-36T
- Crank lengths
- 160, 165, 170, 172.5, 175mm
- BCD
- 110mm asymmetric 4-arm
- Q-factor
- 148mm
- Chainline
- 44.5mm
- Axle
- 24mm Hollowtech II
- Weight
- Approx. 700g (170mm, 50-34T)
- Bottom bracket
- Hollowtech II, e.g. BB-R9100, SM-BB92-41B or SM-BB72-41B (sold separately)
- 46-36T compatibility
- Requires FD-R8150 or FD-R9250 front derailleur
Ordering
Available from The Cycle Collective
Available to order through The Cycle Collective in Dorking. For availability, setup or advice, call 0203 148 6764 or email hello@thecyclecollective.cc.