Hey Im sure people have read over my stupid little thread about my plans or all that haha. Anyways I tried searching but nothing for my question really came up. So I'll ask here. Considering the stock size for the mn12 is 205/70/15. I am planning on putting on 18x9.5 Gt500 Replicas. With the larger I used this tire calculator
and the overall stock diameter of the wheel and tire is 26.3", with the new rim the closest diameter I can get to stock are: 25.7" with a 245/40/18 tire and 26.7" with a 245/45/18 tire.
My question is which would I be better off with? the smaller 245/40/18 or the slightly bigger 245/45/18? Of course tire inflation play a role too my main concern is keeping the speedo as accurate as possible. My gut is telling me that 245/45/18 is what I need to use cause I'd be going only a tiny fraction faster than what the speedo is telling me vs/ going slightly slower than what the speedo says? Or is the difference almost non existent with such a minor change?
What do you think?
PS: Much much would running the 245 vs 255 effect my mileage?
Last edited by punkrokr1701; 05-01-2008 at 04:58 PM.