As good a guideline as any can be found in the SCCA Solo rules for Prepared category cars. It may even be a legal road requirement in some areas (or something quite similar). Either way, it makes sound, logical sense, and if it's good enough for a real production-based competition car . . .
Quote:
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No part of the bodywork or chassis, to the rear of the front wheel opening, shall touch the ground when both tires on the same side of the car are deflated.
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Obviously, clearance to things like front spoilers and exhaust systems is open to whatever any given individual is comfortable with (and how many times the need for repairs will be tolerated - I started getting tired of making new chassis side brackets for a low-mounted aftermarket front sta-bar on a long-ago car after I'd had to do so two or three times).
Norm