the threads I've read here before about wheelskins said they removed the old rotted leather first. Maybe they were suggesting, but hadn't done it themselves.
[Edit]
just saw this on their site...
Quote:
Covering Factory Leather:
Many of these models come equipped with Factory-installed leather covered steering wheels. The Wheelskins size might vary depending upon whether or not the old leather covering is removed. If the Wheelskin is to be installed over the original factory cover, you might need a larger or special order size. Please measure.
