Endurance bike that balances comfort and speed. This was purchased in the "comp" specification (which includes 12 speed Sram Rival electronic gearing and alloy wheels). Sram gearing features interchangeable components which means you can mix any derailleur, shifter, cassette, etc between Rival, Force or Red. Sram also provides the widest range of gears for road bikes which is why I switched from Shimano to Sram. Note that the wheels have been upgraded to Roval carbon C38's. And the crankset was upgraded to Force. This is in pristine condition and has a smooth and wonderful ride quality. You won't find a bike as nice as this for the money.