Quote:
Originally Posted by cfg83
WA1DH -
I agree with Thymeclock's advice. Don't forget to find out how much the new tire weighs in comparison to the current tire you are using.
I am one-size-up from stock. I considered two-sizes-up from stock, but whereas one-size-up added maybe 1 or 2 lbs per tire, two-sizes-up added maybe 4 lbs. Bigger tire sizes make all your gears taller by x%, but heavier tires increase the load on the engine during acceleration (right guyz?!?!?!).
CarloSW2
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I run one up also (way to go CarloSW2!!)
255/45/18 instead of 245/45/18 on stock rims.
It's worth 3.4% to me on the Q45.
And cfg83 is correct, there is a dimishing return due to the added weight. When a tire is rolling the static weight 1-2lbs is now X 4. 4-8lbs per wheel. THis can dramaticly increase the wear and tear on the other componets ...brake parts.....bushings etc......
In my case, since I drive on the freeway for 65% of my 40k a yr, the up size is VERY much a win for me due to the lower rpm at 55mph.
If I was just doing intown.....I'd probably still do it.
and as far as the speedo being correct....
I JUST LOVE!!!!!! multipling my mileage times 1.034 to get my TRUE MPG!!!!