on a hoosier tire they refer to that as a "chalk mark" after the tire is built it goes on a machine that blows it up hot and gets measured and marked that way the tires can be paired and sold. i would not even think of mounting up those tires with that difference in size. on all of my super stock cars the tires have to measure within a 1/4"(mounted with 12# of air) or i will not use them.

i had a customer with a hemi s/g car that just about rebuilt the chassi trying to get it to leave straight it would go hard right every time it left, i asked him to measure the goodyears he was using and they were 1 inch in difference, we installed a set of old 14.5 32 firestone firehawks just to try it out and it went dead straight.

hope this helps.

Thanks Jimi........I did get it resolved. New tires are 1/4" apart.
Summit took care of the original mismatch, as I figured they would.
I was trying not to build in any problems.

I'm in AZ and my last two sets came from Harlows.