- 0
- 46-36T, 50-34T, 52-36T
- 44.5
Specifications
As listed in the manufacturer's catalog.
General
- Series
- ULTEGRA
- Model no.
- FC-R8100
- Color / 1
- Series color
- Rear speeds
- 12
- Compatible chain
- HG 12-speed
- Chain line (mm)
- 44.5
- P.C.D. (mm)
- 110
- Spider/gear arms
- 4
- Chainring combination
- 46-36T, 50-34T, 52-36T
- Q-factor (mm)
- 148
- Optional chain guard / Without chain/bash guard
- Yes
- HOLLOWTECH II
- Yes
- HOLLOWGLIDE
- Yes
- Compatible bottom bracket type / Outboard
- Yes
- Crank fixing screw included
- Yes
- Average weight (g) (170 mm, w/o bottom bracket)
-
Crank arm length (mm)
- 160
- Yes
- 165
- Yes
- 170
- Yes
- 172.5
- Yes
- 175
- Yes
Recommended bottom bracket
- Threaded (normal)
- SM-BBR60
- Press-Fit
- SM-BB72-41B
Threaded bottom bracket shell width (mm)
- 68
- Yes
- 70
- Yes
Crank arm
- Material
- Aluminum
- Finish
- Anodized
Crank axle
- Material
- Steel
- Finish
- Plated
Outer ring
- Material
- Aluminum/CFRP (except 46-36T), Aluminum (46-36T)
- Finish
- Anodized
Inner ring
- Material
- Aluminum
- Finish
- Anodized
Outer/middle ring fixing bolt
- Material
- Aluminum
- Finish
- Anodized
Bicycles
Published bicycles that use it, newest model years first.
No published bicycles yet
No published bicycle names this component in its specifications.