When the extremely finely stepped 18-speed transmission from Swabian manufacture translates your crank movements into the appropriate wheel speed, only the Gates CDX belt drive comes into question for power transmission to the rear wheel. Whether here on the STEVENS P18 or its sister model, the C12 (with 12-speed transmission, also from Pinion): the performance of this ideal drive pairing is convincing from the very first pedal stroke with smooth and quiet running.