Originally Posted by Bill Mack

That's correct, but perhaps not what the OP is looking for. Far be it from me to challenge an aerospace engineer, but I thought Barnsie intended to compare the left and right rear suspension heights, not determine whether the car was within the absolute ride height specs. If the rear tires are inflated to the same pressure, he can see the difference whether he measures from wheel center or the ground.

My .

Originally Posted by gkubrak

Haha don't challenge me, challenge the chaps who wrote the manual! All I vouch for is accurate and reliable data =]. You can compare right to left but measuring is the only thing that will tell you if both or just 1 needs to be replaced.

Different tire brands, materials, pressure, and weight distribution, etc... all affect the height if measured form the floor. The correct measuring method IS NOT dependent on tires or tire pressure.

So if you measure the ride height per the manual, then deflate any (or all) of the tires and measure again, you'll get the same numbers! Engineering at its finest.

Originally Posted by gkubrak

Haha don't challenge me, challenge the chaps who wrote the manual! All I vouch for is accurate and reliable data =]. You can compare right to left but measuring is the only thing that will tell you if both or just 1 needs to be replaced.

Different tire brands, materials, pressure, and weight distribution, etc... all affect the height if measured form the floor. The correct measuring method IS NOT dependent on tires or tire pressure.

So if you measure the ride height per the manual, then deflate any (or all) of the tires and measure again, you'll get the same numbers! Engineering at its finest.

Originally Posted by Bill Mack

... PS, I suspect the measurement according to the manual needs to be done with the car on a flat or nearly flat surface. Yes?