Why WattGap
Aero bike comparison: published CdA for every major bike
Compare aero road bikes on one baseline, with test speed, yaw and source shown.
One place for aero figures
Brand claims and magazine tests are scattered and use different protocols. The WattGap bike database collects them with their test conditions.
Compare at your power
Set your own power, speed and weight to see what each bike's drag means for you, including stock tire rolling resistance.
Always growing
New figures are found in cycling media and added after review; signed-in riders can request missing bikes.
Try it on your own rides
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