Almost forgot. Apparently sidecar riggers have determined the best tire combo for his specific rig, and many like it. He runs a rear tire in reverse on the front wheel. Has the best handling and tread life. Rear bike tire is a car tire on a special wheel. Sidecar has a trailer tire. His rig eats front tires, 3 fronts to one rear tire, and the sidecar (trailer) tire hasnt been changed and still looks brand new.