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Old 08-06-2009, 09:40 AM   #1
Bus Nut
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Re: Tire sizes

11 or 11.00 = width in inches
R= radial
22.5= wheel or rim diameter, aslo the .5 denotes a tubeless tire, a 20,22 0r 24 would be a tube type tire.
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Old 02-02-2011, 09:34 PM   #2
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Re: Tire sizes

Anyone know the outside diameter of 8.25-20-10 or 9-20-10 tires? And the nearest size tubeless substitute?
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Old 02-11-2011, 10:34 PM   #3
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Re: Tire sizes

I think I can say with confidence my 9:00-20's are 40" cuz I just measured them. If my memory is correct my 10:00-20's are the same and I tried to use an 8.25-20 in place of a 900 once and they are 2" difference. If it wasn't so damned cold I would go over to the other building and measure my bus and the 10:00-20's on it and make sure I am right. An 11R22.5 is the same height as an 10:00-20 but is an inch wider. Fact is we just compared a 24.5 to a 22.5 and then to a 22.5 low pro and each is 2" shorter respectively. sportyrick
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Old 02-13-2011, 06:52 PM   #4
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Re: Tire sizes

A 10.00-20's replacement is an 11R22.5 or 295/75R22.5
A 9.00-20 is replaced by a 10R22.5 or 265/75R22.5 (275/70R22.5 should also work)
An 8.25-20 is replaced by a 9R22.5 or 245/75R22.5 (255/70 should also work)

In all cases, the metric sizes are maybe 1" shorter in diameter with the same weight capacity and rim size. If possible, I suggest running 11R22.5's or 295/75R22.5's--these are the industry-standard Class 8 truck sizes and drt-common EVERYWHERE.

Also, Michelin is weird with 22.5" tire sizes: a 295/75 is a 275/80 to them. A 265/75 is a 255/80, a 245/75 is a 235/80. They are the same size, they just don't say so. (Don't look at me, I didn't come up with this cockamamie size thing!)
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