- 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
Shimano 105 R-7100 Hollowtech II Crankset
MODEL NO _ FC-RX820-1
SERIES _ GRX 12-speed
Color _ Series color | Series color
Average weight _ 644 (40T) 656 (42T)
Rear speeds _ 12 - 12
Compatible chain _ HG 12-speed
Chain line (mm) _ 49.7 - 49.7
P.C.D. (mm) _ 110 - 110
Spider/gear arms _ 4
Chainring combination _ 40T, 42T | 40T, 42T
Q-factor (mm) _ 151
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 | SM-BBR60
Recommended bottom bracket|Press-Fit _ SM-BB72 | SM-BB72
Threaded bottom bracket shell width (mm)|68 _ ✔
Threaded bottom bracket shell width (mm)|70 _ ✔
Crank fixing screw included _ ✔-If you are not 100% satisfied with your purchase, you can return the product and we'll refund the full cost of the item minus shipping costs or exchange the product for another one, be it similar or not.
-You can return a product for up to 30 days from the date you purchased it.
-Any product you return must be in the same condition you received it and in the original packaging. Please keep the receipt.