To expound just a bit more on my tread.

Those are just 2d layouts. then I extrude them to a greater thickness than my tread. then from a side view, I create a circlethe size of the tire and offset it the depth of the tread. This give me 2 cutting curves to cut my square tread to be the shape of the round tire. The thing missing from the tire pic would be to fillet the tread. Too heavy for my old computer though. Still drooling for my "dual quad core 30 inch display bad boy". (I'll be sure to brag in this forum when I get it! Ha!)

Anyway, I suppose thats it.