An attractive aluminum crank with hollow arms for lightweight, rigidity, and durability

The newly designed crank arms offer an optimized balance between lightweight and efficiency. The crank, formed with hollow aluminum technology, is anodized with a beautiful gloss black anodized finish, giving it a luxurious look. The resin ribs on the back of the chainrings are SHIMANO 105's unique structural design that achieves both thorough weight reduction and crisp shifting performance.

FEATURES

Optimal balance of stiffness, strength, weight and rotational performance
HOLLOWTECH II structure cuts weight yet maintains strength for better power transfer
Crank arm length: 160, 165, 170, 172.5, 175 mm
Gear combination: 50-34T, 52-36T
Q-factor: 148 mm

PRODUCT SPECIFICATIONS

MODEL NO FC-R7100
SERIES SHIMANO 105 R7100 MECHANICAL Series
Color Black
Average weight 754 (50-34T)
Rear speeds 12
Compatible chain HG 12-speed
Chain line (mm) 44.5
P.C.D. (mm) 110
Spider/gear arms 4
Chainring combination 50-34T, 52-36T
Q-factor (mm) 148
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
Optional chain guard|Without chain/bash guard
HOLLOWTECH II
HOLLOWTECH crank arm
Compatible bottom bracket type|Outboard
Recommended bottom bracket|Threaded (normal) SM-BBR60
Recommended bottom bracket|Press-Fit SM-BB72-41B
Threaded bottom bracket shell width (mm)|68
Threaded bottom bracket shell width (mm)|70
Crank fixing screw included