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Old 04-16-2016, 11:22 AM   #1
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Tire diameter

Does anyone know the actual tire diameter (in inches) for the 22.5 wheels? I'm trying to order covers for the tires but my 364 is in the shop so I can't go measure them myself for another week or so. Amazon has a set for sale that accommodates 40-42 inch diameter. Just want to be sure those will fit before I order.
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Old 04-16-2016, 11:59 AM   #2
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Originally Posted by Melvinson404 View Post
Does anyone know the actual tire diameter (in inches) for the 22.5 tires? I'm trying to order covers for the tires but my 364 is in the shop so I can't go measure them myself for another week or so. Amazon has a set for sale that accommodates 40-42 inch diameter. Just want to be sure those will fit before I order.
The rims are 22.5" not the tires.
What size tires do you have will give you an answer.
Michelin 235/80/22.5 possible?
These tires are 32" diameter
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Old 04-16-2016, 12:01 PM   #3
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The rims are 22.5" not the tires.
What size tires do you have will give you an answer.
235/80/22.5 possible?

Yeah thats the tires but I'm looking for a measurement using a tape measure straight across the tire from edge to edge....
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Old 04-16-2016, 12:02 PM   #4
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Quote:
Originally Posted by Melvinson404 View Post
Yeah thats the tires but I'm looking for a measurement using a tape measure straight across the tire from edge to edge....

Michelin 235/80/22.5 possible?
These tires are 32" diameter
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Old 04-16-2016, 12:20 PM   #5
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Originally Posted by Iggy View Post
Michelin 235/80/22.5 possible?
These tires are 32" diameter
The formula we use to approximate tire diameter with metric width/aspect ratios in the tire biz is as follows. This formula converts the metric numbers to inches in the process.

Using the size Iggy posted as an example:

Section width (235 mm) X aspect ratio (80% of section width)) X 2 (you use 2 to include both sidewalls height)....then divide it by 2540. There are 25.4 mm to an inch, and using 2540 fixes the decimal at this point too. You then added this converted number which will be the two sidewalls height in inches...back to the rim diameter (which is 22.5).....so you will have the approx. diameter (both sidewalls and hole in the middle)

(235) X (80) X 2 = 37600.
37600/2540 = 14.80
14.80 + 22.5 = 37.30 inches approximate diameter

This is just an approximation and can vary a little either way depending on how much tread depth and such there is. By a rule Michelins are usually just a hair shorter than other brands, with the same size.

32 inches would be way too off though, if my math is correct.
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Old 04-16-2016, 12:28 PM   #6
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Originally Posted by Melvinson404 View Post
Yeah thats the tires but I'm looking for a measurement using a tape measure straight across the tire from edge to edge....
The section width using 235/80-22.5 as a reference is 235 millimeters. Now this is the section ,which is the widest part of the tire when loaded at it's nominal carrying capacity....and the actual tread width will be narrower by a little.

Just take 235 and divide it by 25.4 to get the inches.

235/25.4 = 9.25 inches. The actual tread width will be a little narrower though, but that gives you a maximum point of reference.
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Old 04-16-2016, 12:37 PM   #7
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Page 12 of the following Michelin link will show you how close my math is (Both for diameter and width), and how you can use it for approximations.

http://www.michelintruck.com/assets/...ok_Jan2007.pdf
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Old 04-16-2016, 12:41 PM   #8
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Tire covers

I bought the 4 pack of deluxe covers for $50 from Amazon last month for my 2015 xl377. They should be the same tires. Nice covers and the fit is very good.
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Old 04-16-2016, 12:43 PM   #9
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Covers

Sorry, they are the 40 to 42 size.
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Old 04-16-2016, 01:11 PM   #10
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Why can't anyone just read the manufacturers specs.
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