KB58 wrote:
Approach the problem from the opposite direction. Go to Tire Rack or equiv, bring up the super high performance street rubber and see what sizes they carry - end of story. It's an academic argument if what's "right" can't be had; pick something that exists and move on.
I future-proofed Midlana design by designing around tire diameter, so what builders use for wheel size doesn't matter. I had the advantage of starting from a clean sheet, where tire selection is the first design decision. You guys building per plans that assume a really small tire diameter, yeah, that's going to be a problem. Go by tire OD and work backwards.
Tirerack currently carries 12 tires in 195/50R15, 32 in 195/55R15, and 23 in 205/50R15. I wouldn't panic and say the sky is falling when one distributor has 67 different choices. I get the point of making sure tires are still available but as long as the 1st and 2nd generation Miatas are around we're going to see a handful of high performance and all season 15" tires.