Quick question on tyre size
 

Hi I have currently 255 40 19 on the audi but I'm getting a good deal on 245 40 19 would the different size of tyre harm the 4wd system on the car.

Cheers trev

No harm to the 4wd assuming you're replacing all corners. Tyre is a tiny bit smaller.

Thanks mate

http://www.willtheyfit.com/

This is a good website for seeing what differences the wheels/tyres will make to the setup of the car and difference in speed reading etc. if you know the wheel offset and size.

Another good one is www.1010tires.com