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 Di2 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
✔
Specifications
Size
50x34x165mm 12-Spd or
50x34x170mm 12-Spd or
50x34x172.5mm 12-Spd or
52x36x165mm 12-Spd or
52x36x170mm 12-Spd or
52x36x172.5mm 12-Spd
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