ULTEGRA's new FC-R8100 crank shifts as quickly and precisely at the front and has the same efficient power transfer as Shimano riders are used to, but with even more crank arm length options. 
ULTEGRA cranks with lengths from 160 to 175 mm are now also suitable for smaller riders, triathletes and cyclists who want shorter crank arms. 
The FC8100 crank is an essential part of Shimano's new 12-speed racing series and builds on Shimano's legendary gearing and shifting efficiency up front. 
- Optimal balance between stiffness, strength, weight and rotational performance 
- HOLLOWGLIDE structure weighs less but is equally strong for better power transfer and faster and more precise front shifting 
Specifications: 
Brand: Shimano 
Model: Ultegra R8100 
BCD: 110 mm 
Length: 165 mm 
Q factor: 148 mm 
Chainline: 44.5 mm 
Weight: 100 grams 
Rear gears: 12 
Chainring combination: 50/34T 
Compatible Chain: CN-M8100 
Color: Black