Shimano Ultegra FC-R8100 Hollowtech II Crankset

The Ultegra FC-R8100 Crankset by Shimano - For highly efficient power transfer

The Shimano FC-R8100 crankset converts the power you put into your Ultegra 2x12-speed road bike groupset into propulsion with high efficiency. Thanks to the proven Hollowtech II design, it meets all your requirements for stiffness and stability. You also benefit from the precise and fast shifting processes you are used to from Shimano drives. The crank arms are hollow-formed, as is the large chainring, which is partly made of carbon, resulting in significant weight savings. Apart from the axle, all essential parts were made of lightweight metal. FC-R8100 has an asymmetrical 4-arm bolt circle diameter of 110 mm. It produces a chainline of 44.5 mm and has a Q-factor of 148 mm.

Specifications:

Application:

Road

Compatibility:

Shimano 2x12-speed

Chainring Mount:

110 mm bolt circle diameter, 4-arm asymmetrical

Technical Information:

Series:

Ultegra R8100

Crank Arm Material:

aluminium

Chainring Material:

Aluminium / Carbon, Aluminium

Axle Material:

steel

Gradation:

34-50, 36-52

Crank Arm Length:

160.0 mm, 165.0 mm, 170.0 mm, 172.5 mm, 175.0 mm

Chainline:

44.5 mm

Q-Factor:

148 mm

Axle Diameter:

24 mm

Compatible BSA Shell Width:

68 mm

Recommended Bottom Bracket:

SM-BBR60 or SM-BB72-41B Press Fit Hollowtech II (not included)

Recommended Chain:

CN-M8100

Compatibility:

2x12-speed:

Shift/Brake Lever:

ST-R8150, ST-R8170, ST-R8060, ST-R9250, ST-R9270, ST-R9160, ST-R9180, ST-R7170, ST-R7120, ST-RX820, ST-RX610

Front Derailleur:

FD-R8150, FD-R9250, FD-R7150, FD-R7100

Bottom Bracket:

BB-R9100, SM-BB9000, SM-BBR60, SM-BB6700, SM-BB5700, BB-RS501, BB-RS500, SM-BB4600, SM-BB92-41B, SM-BB72-41B, SM-BB71-41B, BB-RS500-PB

Chain:

CN-M8100, CN-M9100, CN-M7100, CN-M6100

Features:

• perfect balance between stiffness, stability, weight and rotational efficiency
• optimised power transfer
• fast, high-precision shifting at the front
• hollow crank arms (Hollowtech)
• hollow-formed large chainring made of aluminium-carbon composite (Hollowglide)
• anodised crank arms and chainrings
• aluminium chainring bolts

Technology:

Hollowtech II
Shimano Hollowtech II is a crank bottom bracket system designed to achieve an ideal ratio of stiffness, weight and rotational efficiency. It is based on an integration of the bottom bracket and the right crank arm and works with a 24 mm axle or bearing diameter, which has proven to be optimal in terms of stability. In many cases, the bearing cups are on the outside so that the load is better distributed. High-quality precision seals ensure a long service life.

Manufacturer Numbers:

160.0 mm 34-50:

I-FCR8100MX04

160.0 mm 36-52:

I-FCR8100MX26

165.0 mm 34-50:

I-FCR8100AX04

165.0 mm 36-52:

I-FCR8100AX26

170.0 mm 34-50:

I-FCR8100CX04

170.0 mm 36-52:

I-FCR8100CX26

172.5 mm 34-50:

I-FCR8100DX04

172.5 mm 36-52:

I-FCR8100DX26

175.0 mm 34-50:

I-FCR8100EX04

175.0 mm 36-52:

I-FCR8100EX26

Contents:

• 1 x Shimano Ultegra FC-R8100 crankset (34-50 or 36-52 tooth)
• 1 x Shimano crank bolt