Keith
Are you running the standard 16" wheels? For me because I run both 18" road wheels and the 16" standard rims with the 265/75's for off road all of my set ups were done using the centre of the wheel to lip of guard. That way the wheel diameter played no part in the equasion. As a final "check" I also measured ground to lip of guard (make sure the tyres are at the right psi before checking ;))
Gary

