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· Mid-life Realization!
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michaelvanle said:
45/40 is the combo on 17" wheels. On 18", it's 40/35.
This is due to the different wheel/tire widths from front to back.

Depending on the tire width and if you are trying to maintain overall stock height, so your speedo remains accurate and have heard could also affect your abs. For instance, for my 18" rears running 295's, a 30 profile keeps my wheel/tire height very close to stock.

Brad
 

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You go one size smaller on the sidewalls given that you'll have a wider tire in the back. Reason for it is so the tire doesnt look like a balloon.
 
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