I seriously do have a question. For the zillions of cars that come with a donut standard but usually have full-sized spare tires (either a factory or dealer option), can we put in a full sized spare tire?

And since we can change the wheels on the ground - can we put a different wheel and tire (assuming it meets the same rules as the wheels on the ground)?

I really do think that if the wheel/tire is legal for the ones on the ground than it should be legal to carry as a spare. A 70lb wheel with extra balance weights filled with buckshot is NOT legal to race on and would not pass tech.

My interest? I carry a 5th matched wheel around with me. I'd just assume strap it in the car than have to cart it around in the back of my SUV. Heck, I think it's lighter than the donut anyway!