The shimano fc-rx610-2 combines weight savings and optimized efficiency for mixed terrain riding and competition. Development options meet the demands of gravel, while maintaining the tighter ratios needed to maintain your position in the peloton. 2x12 crankset uses a combination of 46-30d chainrings, and 165, 170, 172.5, and 175 mm long cranks.Low development gaps for pedaling cadence control in mixed terrainDevelopment range optimized for Gravel preserves pedaling rhythm on rough surfacesSprocket combination : Crank length (mm): Chain guard: Without CGColor: Color seriesGear combination: Packaging: Individually wrapped