Whats the biggest tire you ever put on a 14 x5.5 rim

67Mopar said

i want the fattest tallest tire for a 14 inch a body 72 scamp with a 5.5 stock steel rim, hows that?

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No such thing, really...

You could go with a 225-70-14 on the rear.... It would be about 26.5" tall and as wide as you can put on the wheel.

Match that with a 205-70-14 @ 25.4" tall on the front. You could also try a 215-70-14 @ 25.9" tall on the front (Some start having tire to fender interference in the front when the tire gets around 26")