tire circumference question/speedo accuracy

[ca911]

hi everyone,

I am thinking of putting style 87 wheels on my 3.0i with Sport Package and I was wondering what concerns I had to have in regards to tire circumference and messing up the speedometer/etc.

My current wheels are the sport wheels, which I believe are 255/55-18 wheels and the tires I was looking for for the style 87s are the Michelin Diamaris 275/40-20 and 315/35-20 staggered set.

I figured out that the circumference of these are around 90 where my current tires are around 91. Will this give me any issues with my speedometer accuracy or any other sort of problems?

Thanks!