new member from mchenry IL - Team Camaro Tech
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post #1 of 3 (permalink) Old Mar 25th, 14, 11:29 AM Thread Starter
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new member from mchenry IL

hi all I have a 67 that i have been working on for 8 years. almost done does any one know if i go from a 255/60/15 to a 272/60/15 will it lower my RPMs and how much. thanks for the help.
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post #2 of 3 (permalink) Old Mar 25th, 14, 11:56 AM
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Re: new member from mchenry IL

Hi Joe, I think has a Chart for RPM


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post #3 of 3 (permalink) Old Mar 25th, 14, 12:47 PM
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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)

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