The Shimano 105 FC-RS520 is a 2-piece 4-arm crank that's compatible with modern disc brake road frames.4-arm crankset for 12-speed drivetrain Compatible with frames of O.L.D. 135mm and 410mm chainstay length 44.5mm chainline 150mm Q-factor Compatible with HG 12-speed chains
| Color | Black |
| Rings | 50/34 |
| Number of Chainrings | Double |
| Crank Length (mm) | 165, 170, 172.5, 175 |
| Crank Intended Use | Road |
| Drivetrain Speeds | 12 |
| BB Included | No |
| Pedal Spindle | 9/16" |
| Spindle Interface Type | Shimano Hollowtech II |
| Chainring BCD | 110 Shimano Asymmetric |
| Chainline/Hub Compatibility | 135/142 Road Disc Hubs > 415 mm Chainstay |
| Defined Color | Black |
| keyword search | 105 |
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