255/60/15 tire availability

YY1 said
...but by the numbers, as stated in the thread above, Both the the Master Craft and the Cooper are better tires for a lower cost. Cooper has at least as good a brand reputation as Goodrich (again, actually made by Coker), and I'd wager so does Hankook. Hankook is taping the specialized labor force in Akron, OH, as the other American MFGs are laying them off. That's smart business.

My 255's went right on to the 6.5 rims with my ancient Atlas changer. No stretching or undo resistance. They look like they were made for them. No bulging sidewalls or crowned tread surface.

If you want to go to the track, I think an affordable drag radial on a spare set of rims is probably the path of least resistance. Maybe even a sticky street/drag tire (like the MT), so you can drive to the track and change them out at home.

Better numbers? For what? A 440 treadwear rating is not better than a 400 unless you’re shopping for a commuter. The higher the number, the harder the compound. Which isn’t better for a performance tire, it’s worse. Less traction. Sure, the tires will last longer, but most people will have to replace their tires on time rather than wear on their classics. You don’t need 60k+ mile tires on a car that gets driven as little as most folks drive their classics, they’re just gonna get tossed at 10 years (or less) with half their tread left.

As for installing 255’s on a 6.5” rim, it’s just a waste of money. Whether you see it or not, the tread is being squeezed down. Measure them if you don’t believe me, I bet they won’t match the specs you see posted by the manufacturer. It probably isn’t much because it’s only a 1/2” narrower rim, but it’ll be something. And unless you installed them by hand with a set of spoons, you’re not going to see any extra resistance. The tire machine is capable of a lot more than that.