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Old 07-30-2014, 01:47 PM   #1
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Need help with tire size

Our 2005 CC Allure needs new tires and currently has 12R/22.5's on it. I was advised on the CC owners forum that the closest metric size would be 295/80/22.5 in the Michelin xza2 tires that I wanted as replacements. I have now been told by two tire dealers that the 295's are much smaller than the 295's. Is there anyone here that has gone from the 12R's to the 295's?
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Old 07-30-2014, 01:58 PM   #2
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Me thinks you would be well served to review THIS thread posted a couple of years back.

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Old 07-30-2014, 09:51 PM   #3
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My yokos 275/70r22.5 are also labeled as a 12r22.5. a 295 would be a larger tire
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Old 07-30-2014, 10:43 PM   #4
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I think you can better make a good decision with this information:


295/75-R22.5 vs 295/80-R22.5 Tire Comparison - Tire Size Calculator



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Old 07-31-2014, 11:44 AM   #5
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You need to get into the details of "size" to answer this. The three aspects of size that are important are the tire diameter, tire width, and tire load (weight) carrying capacity.

I'm running 11R22.5's as replacements for my rear 295/80R22.5 and they are almost an exact match for the tire diameter but somewhat less in load carrying capacity. The 12R22.5 is a little bit wider and taller, with more load capacity. It more closely matches the 295/80 for load but the speedometer/odometer would be inaccurate because of the diameter difference. The 295/80 makes more revolutions per mile than a 12R. The 12R is also wider than a 295/80, which is important consideration for rear duals.

Since you would be going slightly down in size with the 295/80, your speed and odo would read slightly low.Dual spacing should be fine because the 295/80 is a bit narrower. Just make sure the max load capacity is sufficient for your front axle (only the front will need checking - you will have plenty for the rear and tag). Most 12R and 295/80 have the same 7830 lb max load rating, but double check that before buying.
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Old 08-04-2014, 07:25 AM   #6
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Quote:
Originally Posted by TBS-POPS View Post
My yokos 275/70r22.5 are also labeled as a 12r22.5. a 295 would be a larger tire
I retract this statement, they are labeled 11r70/22.5. Sorry for the mis info.
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Old 08-04-2014, 09:52 AM   #7
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Quote:
they are labeled 11r70/22.5. Sorry for the mis info.
That's still odd, since an 11R22.5 tire is approximately a 0.88 profile (aspect ratio), not 0.70. Aspect ratio is not normally stated with inch-sized truck tires because the .88 is industry-standard for that type. But just because something is an industry standard doesn't mean that everybody does it exactly that way...
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