From my observation, it seems as the front strut/shock, strut mounts and spring pads wear, the front suspension lowers or drops a bit. I did NOT measure before replacing those things, and perhaps its the Blistien 4600. But my Commander (V6) seem to have a bit more forward rake with the front suspension "appearing" to be lower after 100k miles from new. New Strut/Shock, Strut Mounts and Spring Pads and the front was raised right up after the job to be level, but over a few days it settled out to the forward rake again, but NOT as bad as before, it seems to be holding at my impression of what it was when it was new.
The lift the bigger tires add is simply 1/2 the difference of the diameter between old and new tires.
OEM Tires were P245/65-R17 which should be 29.54" in diameter. (I think all Commanders came with this tire size OEM, I might be wrong)
Your tires are P265/70-R17 should be 31.61" in diameter.
(29.54"-31.61")/2=1.04" increase in ground clearance by the tire alone.
Keep in mind, the tire sizes are for the carcass/structure/frame of the tire, deriving the overall dimensions from those sizes will just produce approximate numbers that vary slightly from brand to brand and even model to model within a brand. But it should be close. The tire pressure will effect its overall height as well for obvious reasons.
Safe to say, unless you're running your tires "aired" down, you got 1" of lift in the ground clearance.
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Last edited by Mongo; 12-14-2015 at 09:54 AM.