HOW MUCH TALLER IS A 11R22.5 VS LP22.5 - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 3 (permalink) Old 09-12-2010, 05:30 PM Thread Starter
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HOW MUCH TALLER IS A 11R22.5 VS LP22.5

MY TRUCK HAS 295-75-22.5 HOW MUCH TALLER IS A 11R 22.5 AND WOULD IT MAKE A DIFF ON RPMS
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post #2 of 3 (permalink) Old 09-12-2010, 06:11 PM Thread Starter
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is this right
To compute the approximate size of an 11R22.5: Tire sidewall height = 11 inches (tire width) X 90% (tire profile) X 2 (two sidewall sections, one above the wheel, one below) + 22.5 inches (wheel diameter)
11 X .90 = 9.9" X 2 = 19.8" + 22.5" = 42.3"
In low profile tires, a more modern metric sizing is used: i.e. 295/75R22.5. Here, the width (295) is expressed in millimeters, the profile (75) is included in the size, and the wheel is still shown in inches (22.5) To compute the approximate size of a 295/75R22.5: Convert the metric width to inches (295 divided by 25.4 = 11.6 inches) then compute the same as above - only use a profile of 75%
11.6 X .75 = 8.7" X 2 = 17.4" + 22.5" = 39.9"
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post #3 of 3 (permalink) Old 09-12-2010, 08:05 PM
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try this link http://www.roadranger.com/ecm/groups.../ct_062746.swf
it is a ratio/tire size calculator from Roadranger
it shows a 11R22.5 @ 498 revs per mile
275/80R22.5 @ 516 revs per mile
And I think the 295/75R22.5 is same diameter (according to tire guys)

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