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Old 06-04-2024, 11:56 AM   #1
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Tire replacement on 2013 Adventurer 32H

I'm replacing the tires on my 2013 Winnebago Adventurer 32H. The current tires are Michelin 235/80R/22.5. I'm looking at the Toyo M154 245/75R/22.5 but am having problems sourcing them in my area. One of the dealers claims he can easily source the Toyo 255/80R/22.5. I'm wondering if they will be too wide on the rear duals. Does anyone know the answer?
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Old 06-04-2024, 10:04 PM   #2
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Hi briggzee,
I am certain that the dualies must have an air gap between the bulged-out centers of them, to facilitate tire cooling and to accommodate contact load bulge.
That first number is the width of the tread, in millimeters.
The space between the dualies would decrease by:
  • 255mm - 235mm = 20mm = 0.7874"
So, do you have at least ", PLUS extra space for an air gap between the tires now? (measured at the lowest point of the dualies, where contact load bulge decreases the clearance even more.)
Diameter of original tires:
  • 235mm = 9.2126"
  • Height of rubber = 80% 9.2126" 2 = 14.74"
  • Total diameter = 14.74" + 22.50" = 37.24"
Diameter of proposed tires:
  • 255mm = 10.0394"
  • Height of rubber = 80% 10.0394" 2 = 16.06"
  • Total diameter = 16.06" + 22.50" = 38.56"
So, if your speedometer is accurate now, when you are really going 60 mph, your speedometer will indicate:
  • 37.24" 38.56" 60 mph = 58 mph
Another way to think about it is it will reduce your final drive ratios by 3%
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Old 06-12-2024, 09:16 AM   #3
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The space between the bulge at the lowest point is 2 inches. I believe if I took your calculation 255mm - 235mm = 20mm = 0.7874" and times it by 2 for 2 tires it would be 40mm or 1.57 inches which would only leave approx. 1/2 inch of space. According to what I've been able find 1 1/2" is the DOT minimum. If I went with the Toyo M154 245/75R/22.5 the space would be 10mm x 2 for 20mm so about 3/4 of and inch leaving 1 1/4 which is still not enough space. I may have to replace with the Michelin 235/80R/22.5 size which is the current tire. Any further thoughts on this will be appreciated.
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Old 06-12-2024, 09:39 AM   #4
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Hi briggzee,
When moving from a 235mm to a 255mm wide tire, the tire is " 2 = 3/8" wider on each side. Measured from the centerline of each tire, each tire is 3/8" closer to the other, so the decrease in clearance between the two tires is " total.
I do not know from where the D.O.T. minimum clearance is measured, but perhaps you might still be OK with 2" - " = 1" clearance at the bulgiest part of the tires. Do you know from where the 1" clearance requirement is to be measured?
Thanks, Eagle5
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Old 06-16-2024, 04:07 PM   #5
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Have you confirmed the Toyos can support the same or greater load as the OE Michelins? At what inflation?
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Old 06-16-2024, 07:41 PM   #6
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err....
Have you confirmed the Toyos can support the same or greater load as the OE Michelins? At what inflation?
Tireman those "original tires" are the same original tires I have on my 36' Journey with a 13 ton GVWR.
dono what they are doing on that...
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Old 06-16-2024, 08:23 PM   #7
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wow just looked up the specs on the 32h... very impressive
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Old 06-19-2024, 12:05 PM   #8
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I went with the Toyo M154 245/75R/22.5. Checked the bulge gap at the bottom and it's 2" so lots of space there. I can feel the difference in handling already and will get out on the highway tomorrow to give them a good test. My old tires were 10 years old so well past their best before date. I've learned a lot about tires and definately found that tread depth isn't the only factor. The side walls on the original Michelin's had cracked so this expedited the purchase of new boots.
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