Shimano Ultegra FC-R8100 Crankset

ULTEGRA's new FC-R8100 crank maintains thesame quick, precise front shifting and efficient power transfer that Shimanoriders have grown accustomed to, but with even more crank arm length options.Spanning 160 to 175 mm in length, ULTEGRA cranks now cater to smaller riders,triathletes, and cyclists curious about shorter crank arms.

An integral part of Shimano's new 12-speedroad lineup, the FC-R8100 crank builds upon Shimano's legendary front shiftingand transmission efficiency. With new refinements for seamless 12-speedshifting, the ULTEGRA crank is now offered in lengths from 160 to 175 mm,bringing performance and improved fit for smaller riders, triathletes, and riderswith specific biomechanical requirements.

FEATURES:

Optimal balance of stiffness, strength,weight and rotational performance

HOLLOWGLIDE structure cuts weight yetmaintains strength for better power transfer and quicker, more precise frontshifting

52-36 and 50-34 chainring options. 160,165, 170, 172.5, and 175 mm crank arm lengths.

SPECIFICATIONS:

MODEL NO    FC-R8100

SERIES    ULTEGRAR8100 Series

Average weight      711 (52-36T) 700 (50-34T)

Threaded bottom bracket shell width (mm)_70  ✔

Chainring combination 52-36T 50-34T

Compatible bottom bracket type_Outboard         ✔

Crank fixing screw included ✔

Crank arm length (mm)_160         ✔

Crank arm length (mm)_165         ✔

Crank arm length (mm)_170         ✔

Crank arm length (mm)_172.5      ✔

Crank arm length (mm)_175         ✔

Spider/Gear arms 4

HOLLOWGLIDE      ✔

HOLLOWTECH II    ✔

HOLLOWTECH crank arm      ✔

Optional chain guard_Without chain/bashguard         ✔

Recommended bottom bracket_Press-fit      SM-BB72-41B

Recommended bottom bracket_Threaded(normal)    SM-BBR60

Threaded bottom bracket shell width (mm)_68  ✔

Q-factor (mm)       148

Chain line (mm)     44.5

Compatible chain   CN-M8100

P.C.D. (mm)    110

Rear speeds   12