[mrrec]

Thanks, Joe.
Marlin, Gary: Bias ply tires have "plies" or cords running from bead to bead on an angle or bias (not at a right angle to the bead as in a radial). Belted tires have a "belt" (picture a wide, flat belt running radially around the tread of the tire) over the cord plies and under the tread. Do a Google search for "tire construction" and see what pops up.

Belted tires first used fiberglass belts, then steel belts became prevelant in the mid 70's on radials. There is a real mix out there nowadays. Incidentally, to the best of my knowledge, there has never been a steel belted bias ply!

Kelsey, the distributor of vintage Goodyears, has F70x15 Polyglas and Wide Tread and F60x15 Polyglas (and E70x15 for the Z - the E70s for the Z28 weather Goodyear or Firestone, were not belted. Hard to figure, I know). In the Firestone brand, add G70x15.

And Gary, the Vette guys say the Polyglas is wrong for ANY Vette through 72. You need Wide Teads to be correct. But if you must have Polyglas, and you don't want repros, I have a set of original 1972 (I think) dated F70-15 Polyglas that are very good to mint.

That's enough, I'm tired (couldn't resist).
Dave