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As NeilK says... The issue is the angle at the top and the bottom of the ramp (actually the rate of change of angle)
At the top the risk is grounding the middle of the car as the front goes over the angle first...
At the bottom then the risk is grounding the front end first and then scraping the rear.
Those angles will determine whether or not you can use the ramp not the absolute angle of the ramp.
If it goes from flat to ramp in a single go then 21 degrees going to be a problem on a Carrera...
(I've designed, built a ramp at 22 degrees and then had to drive my Clients' Carrera on it... however the approach and departure angles were well controlled to avoid bottoming out..)
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Share with me. Teach me something I didn't know. Make me think. But don't make me a bit player in your passion play of egotism. Dueller. 13/03/09
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