Wide array of options delivers optimal gravel gearing for variety of riders
The SHIMANO FC-RX820-1 crank balances weight savings, optimized efficiency and an array of gearing options that cater to the segmented demands of mixed-terrain riding. By pairing a 10-45T or 10-51T cassette with 40T and 42T chainrings, riders can choose closer gear steps or ultimate range. The FC-RX820-1 comes in 170, 172.5, and 175 mm crank arm lengths, providing an additional level of customization.
FEATURES
- Optimal gearing for mixed-terrain riding
- 10-45T and 10-51T cassette options serve array of riding styles
- 42T and 40T chainrings available
PRODUCT SPECIFICATIONS
| MODEL NO | FC-RX820-1 |
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| SERIES | GRX 12-speed |
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| Color | Series color |
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| Average weight | 644 (40T) 656 (42T) |
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| Rear speeds | 12 |
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| Compatible chain | HG 12-speed |
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| Chain line (mm) | 49.7 |
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| P.C.D. (mm) | 110 |
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| Spider/gear arms | 4 |
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| Chainring combination | 40T, 42T |
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| Q-factor (mm) | 151 |
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| Crank arm length (mm)|170 | ✔ |
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| Crank arm length (mm)|172.5 | ✔ |
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| Crank arm length (mm)|175 | ✔ |
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| Optional chain guard|Without chain/bash guard | ✔ |
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| HOLLOWTECH II | ✔ |
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| HOLLOWTECH crank arm | ✔ |
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| Compatible bottom bracket type|Outboard | ✔ |
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| Recommended bottom bracket|Threaded (normal) | SM-BBR60 |
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| Recommended bottom bracket|Press-Fit | SM-BB72 |
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| Threaded bottom bracket shell width (mm)|68 | ✔ |
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| Threaded bottom bracket shell width (mm)|70 | ✔ |
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| Crank fixing screw included | ✔ |
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