I have similar measurements as yours at the wheel arches, JJR. I have made up a simple Go No-Go device for measuring the ground clearance under the silencer, a block of 100x50mm wood with a 6mm hole drilled in it to take a 60x6mm gutter bolt. The bolt can be pushed up or down to just slide under the low point of the car. A long handled brush is a handy tool for manoeuvring the gauge to the right spot. My measurement is 80mm of clearance, 28psi in tyres and unloaded. I would be happier with 105mm that some have mentioned in other posts.
