I have an opportunity to buy a set of Wedsport sa90s with star specs. They seem to be in shape judging by the pictures he sent me. He gave me a price but I was wondering what you guys think a reasonable price could be?

Apparently the back are concave and the front are convex. I don't know what that means. Can someone explain concave and convex?

I know its the shape of the wheel but what purpose does this setup serve?

 

The face being concave or convex is mostly an effect of the offset. Lower offset the center tends to be sunken in higher tends to be pushed out. Look at my build thread and my wheels and it should make a bit more sense. It's just a look thing concave looks cool but generally needs a low offset.

What are the specs on the wheels and how many miles are on the tire and what size are the tires? Those tires are a good $700 new but it the are heavily used they are basically worthless.

 

It's common for roadsters/ sports cars to common with a staggered set up. This means that the front wheels are not as wide as the rears. Is some cases this means that the rears are concave and the fronts are convex. This also means that usually you will run a wider tire in the rear and smaller up front.