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Old 07-29-2015, 09:32 PM   #15
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7.5 will work just fine. That is a common rim size on motor homes.

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Old 07-29-2015, 09:50 PM   #16
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Originally Posted by stuhly View Post
7.5 will work just fine. That is a common rim size on motor homes.
I found another chart that confirms that. So I could upgrade to 275. One thing I know is after 5 on Friday when blowouts occur I can get my 255's most anywhere on mobile service.
Thanks for the info.

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Old 07-30-2015, 04:40 AM   #17
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My greatest difficulty in switching from 255/80R22.5 to 275/70R22.5 was identifying tires that would unquestionably work with my 7.50" wheels. My rear wheel openings are too tight for 8.25" wheels. I would almost certainly have had tire-body contact when maneuvering over uneven ground. Many 275 tires really need 8.25" wheels, but Michelin is adamant that my tire (XZA2) works best on the 7.50" wheels. My only realistic alternative, at the time, was Hankook, and they recommended the 8.25" wheel for reliably adequate dual spacing.

I'm sure that there is a similar gray area when transitioning from 6.50" wheels to 7.25. It's a good idea to measure carefully and consider how much body movement you have, especially over large curbs and uneven campground spaces, before buying thousands of dollars worth of tires. If, after all of my research, my tires rubbed on the body, I was committed to trimming part of the fender lip to accommodate the tires. I've been to a couple of campgrounds where I was concerned, but no contact so far. It seems OK.

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Old 07-30-2015, 08:51 AM   #18
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You folks really have your acts together! I could never have obtained that much personal-experience based information from a tire shop. Thank you all so very much for your insight, personal experiences, and tire charts. Having experienced three blowouts on one trip on the old Class C, the information you provided is invaluable to me. Having had a MH that struggled a bit towing my Jeep, I think I'll opt for the slightly smaller size, as the new(er) MH is much larger, with the 8.1 gas engine & Allison. Though the extra gearing will help, I sure hate straining the engine towing up hills! I was set to balance with powder too, but think for the first balancing I'll go with the spin balance, so I can reject any poorly mfg. tire.
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Old 07-30-2015, 02:11 PM   #19
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Changing tire size on 22.5 rims

It's up to you, but as I said before your size tires ARE available.

Just had my 255/80/22.5 Michelin XRV installed two hours ago, manufactured less than one month ago.

I decided to stay with the size the motorhome manufacturer chose, the OEM, simplest and best solution for me.

You can easily get 235's if you choose. See my previous posts.

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Old 07-30-2015, 05:42 PM   #20
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Dual spacing is determined by rim offset. Rim offset is shown below as HDS (half dual spacing) You can measure dual spacing by measuring to the same point of each tire. Even on your present tires before you change size. (Center of each tread or the 1st tread groove on each tire, etc) The spacing is based on the rims, not the tires..

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Old 07-30-2015, 06:05 PM   #21
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I went from 255/80's to 275/80's on my 7.5 Rims - no sweat - No Foul !
Plenty of room on the Duals as recommended by Michelin and My Tire Guy.
Bigger is better as they say ! We'll maybe !

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