Re: new member from mchenry IL
255/60/15 = 27.05 diameter
275/60/15 = 27.99 diameter
275/60/15 is 3% larger in diameter so it will reduce your RPM's by 3%. If you are now running 2,500 RPM at 55 mph you will reduce to 2,450 RPM. Not much difference.
(I went with 275/60/15 because I didn't see 272/60/15 listed)
302DZ, M22W Muncie, GV overdrive,12-Bolt Rear 3.73
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Member # 159