With a side car I see no reason you couldn't run a car tire. Right now I work selling tires and I think I still have a worn out stock size tire. I'll take that in to work with me and do some comparisons. Have to do it soon though since looks like I am getting a promotion to management and a different department.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!