Just a guess but it was likely 7:10x15 stock so I'm thinking 225R-75x15 would be about the same nowadays. An 85 series would be taller if there is such a thing in a 225. I agree with squeeze that going wider is not a good thing and will make it steer like a log truck. In other words don't try to re-engineer the thing. The builders knew what they were doing.


1953 Chevy 5-window 3100
In the Stovebolt Gallery
More pix on Picturetrail

Dave
Engine & Driveline Moderator

If you can't make seventy by an easy road, don't go. ~~ Mark Twain