It was of some help thank you but..still hard to tell. I've been searching for redline tires for some time now and they appear to have four different types.. I suppose I can modify a chosen wheel to accept them..but what are the widths? I like to use slightly wider tires on the back...like say..a 275-60-15. Another example..they have a whitewall tire called a "1959 amt" and appears quite similar in size to their "nascar" wheels. Just saying..be nice to have a measurement of width and outside diameter. It would take all of ten minutes to do it.