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Originally Posted by Rooz
Had a little time on my hand today...
Let's figure out the diameter of the factory setup...
Considering that 1 inch = 25.4 mm
Front: 225/25.4 = 8.8.....
8.8.... * .45 (45% of width is tire profile) = 3.9....
3.9... * 2 (top + bottom) + 17 (wheel size) = 24.97...
So the factory front setup is 24.97 inches tall
I'll spare you the explanations for the rear..
Rear 245/40/17 = 24.71 inches tall
Now, again.. I don't know too, too much if I'm correct but my guess is I need to come as close to those numbers as possible, right?
SO..... from what I calculated here's the closest setup I could think of on an 18" wheel....
Front: 235/40/18 = 25.4 inches tall
Rear: 255/35/18 = 25.02 inches tall
BUT... A 225/40/18 = 25.08 inches tall...HOWEVER being that the wheel is 8.5" wide (inside proportions so I am ASSUMING outside proportion is probably close to 9")
9" = 228.6 mm Meaning a 225mm tire would be too narrow for this wheel? AM I correct? And IF the wheel's INNER width is 8.5" then the 235/40/18 would be the proper setup, but if 8.5" is the outside width then 8.5" = 215.9mm, then the 225/40/18 would be perfect?
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I posted that a long time ago, hope it helps