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Wheel Covers
What is it? Profiled covers, which fit over a regular spoked wheel to convert it into an aerodynamic disc wheel. Available in Standard, Lightweight and Premium lay-ups. The Lightweight and Premium both offer around a 10% weight saving over the Standard, while the Premium also features a distinctive 'spread-tow' chequerboard carbon finish, like this:-
Premium Carbon Finish Wheelcovers are available in a number of shapes to suit frames with close-fitting, curved chainstays and seatstays, including specific frames like the Planet-X Stealth, Specialized Transition etc.
How does it work? All the wind-tunnel tests show that a disc wheel has the lowest drag of all types. Furthermore, as the yaw angle increases (greater relative side-wind), the drag reduces even more and in some cases can become negative - like a sail driving you forwards. For this to happen, the airflow needs to stay attached on the leeward side of the disc. This happens best if the disc is lenticular (lens-shaped) rather than flat, in the same way that an aerofoil works better than a flat aircraft wing. What can it do for me? A flat disc is generally found in wind-tunnel tests to be worth a saving of about 30-40 seconds over a 25-mile time-trial compared with a standard road wheel. A lenticular disc or a set of wheel-covers can improve a further 5-10 seconds on that, possibly more in a stronger crosswind. Performance estimates are based on a number of assumptions. Individual results may vary. Key assumptions are:- |
Price:- Please remember to put in details of your rim and hub combination and any other information required. Refer to previous e-mails if you have enquired earlier. (You can also add notes at the Paypal page.) We have data for the following hubs:- Wheelcovers can be made to various depths and dishes to accommodate shallow rims up to 100mm deep rims. Instructions:- |
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