Best Wheels

Question> Consider a vehicle traveling at 45 mph. If the angular velocity of the vehicles wheels is 39.6 radians per second, what must be the outermost diameter of the wheels in inchest? How do you solve this problem? The answer is 40.0 inches.

A circle with an inside diameter equally divisible by seven, such as 21" or 35", will work out perfectly; however, if you divide 360 degress by seven, it never comes out exact, there is always a fraction.

I drive a '02 Volvo S40.

Its a good car, and I don't want to get rid of it, but its plain and a bit more conservative than I would like.

If I were to put larger wheels and low-profile tires on it, how large of rims could I fit without cutting into the wheel-wells? The standard wheel on my car is a 15" diameter.

Sorry for my ignorance. I just bought a Misubishi Lancer (I think its the 2006 model with either 1.6 or 1.8). Im not sure about this because it was given as a gift to me.

Anyhow, the wheels size is 195/60 R15. And i am wondering if its possible to actually add bigger wheels to it? I want to add alloy wheels but it only looks good when the alloy wheel itself has a wider diameter.

Please advise. Im new to this car modifying thing. Although this is even lower then basic hehe.

Thanks!