[Dan in Pasadena]

Thanks very much JJ, super helpful!

I've been hand calculating diameters and then manually looking up tire sizes on Tirerack - tedious, slow and many times there wasn't a size made that I'm searching for.

Are the tires referenced on this site current?

PS: What do most guys use as a "rule of thumb" on max tire width on a given rim width? For example, an 8" wide rim converts to 201.6mm wide(25.2mm per inch). I assume I would use a tire that is approximately 1" wider than the rim, so 225mm though I know I can go somewhat larger. The question is how much larger?

I don't think I'd be too worried about going up to say 245 or even 255, but that's just a guess. I don't want ridiculously pinched sidewalls. I don't think my front rims/tires will be too much a concern. But the rears may. I'm considering a 9" rim and possibly larger.