Wheelbuilder spent a day in the San Diego Low Speed Wind Tunnel with the objective of comparing our AeroJacket disc covers to uncovered wheels and disc wheels. The obvious advantage of racing with a disc cover is cost, however this data quantifies the performance advantage.
- Uncovered 30mm aluminum rim
- Uncovered Zipp 404 tubular
- Zipp 900 Tubular Disc (flat)
- Zipp Sub-9 (toroidal bulge)
- AeroJacket on Zipp 808 tubular
- AeroJacket on 30mm aluminum rim
Wheelbuilder.com AeroJacket Disc Comparision
- A covered wheel has dramatically lower aerodynamic drag than an uncovered wheel.
- Disc cover performance is virtually identical to disc wheels through the entire range of yaw angles: 0-30 degrees.
- A covered 81mm deep wheel outperformed flat disc wheels in every wind condition. The covered Zipp 808 has less drag than the fastest disc wheel tested beyond 10 degrees of yaw.
- A typical 30mm training wheel with disc covers approaches the performance of a flat disc at 7.5 degrees of yaw, but exceeds performance of all disc wheels tested at wind angles greater than 12.5 degrees.
- The lens-shape on a disc-cover's non-drive side causes wind to pass around it like a wing, producing forward thrust. This effect is more pronounced on covered shallow wheels beyond 20 degrees of yaw.