Seems to me that the old 60 series bias ply tires were bigger than the radial. Say a G-60-14 radial would have been smaller than the big bias "Torque Twister" G-60. I think the edges of the tire were built up alot more also. That would give it a wider look too. A G-60 radial would put the tire size at about a 215/60 to a 225/60.