Tire diameter is dependent on rim width. Your 7" rim is making the tire taller. I believe the recommended rim width for a 275 is 8"-10" so your narrow rim is creating a taller profile.
When checking tire sizes you will see that the diameter is measured on a certain width rim. Going wider or narrower will alter the number slightly and an inch isn't uncommon.
Mark
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"Bad Ast" Astro Van Pro-Touring Project.... Heat, beat, file to fit, paint to match...
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