While the wheel and tire only test focuses more on the front wheel, the full bike gives a perspective of how the rear interacts with air flowing past the front wheel and frame, which can allow for unique designs for each wheel. In testing, the 30mm wide wheels tested nearly identical, with a significant increase in performance over the wider wheels at the higher yaw angles. For the 30mm tires, the 25mm internal width tire actually tested slowest of the bunch, as the tire was 0.7mm wider than the 23mm internal rim.