Polyglas tires?

Ok so I got a set of G78 polyglas tires from a neighbor for my stock rear wheels until I finish sanding off all the old chrome from my junkyard daisy mags(15s), spraying them, and slappin on those 275/60s.. My question is how was the sizing done back then? The G78s look to be like a 215/75.. But I'm not too sure.. Help?

 

I hope your not going to drive anywhere with them, they have to be atleast 20+ years old.

 

Haha! No I did take them for a spin.. That is I spun 'em, well one at least to make a little smoke. I have a couple of 205/75-14s that I use for everyday driving. I just thought the tires looked pretty cool, especially after a little cleaning and some tire shine. They're gonna collect dust in my garage for now... But yeah, he told me they were of his 60 something or other Goat so I'm sure they're old as dirt.

 

http://www.planethoustonamx.com/main/tire_conversion_chart.htm

Try this chart.

 

awesome! Thanks! That's going in my bookmarks

 

are those tires "gummy"