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Old 04-22-2015, 06:46 PM   #1
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Substitute size for 255-80R-22.5?

Is there a tire size that will substitute for a 255-80R-22.5? Michelin seems to be the only manufacturer making that exact size. I'm not sold on the Michelins for our Discovery 37G. (Frankly, have heard some horror stories about Michelins and blowouts.)


Thanks,


Mel
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Old 04-22-2015, 07:11 PM   #2
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Quote:
Originally Posted by MPH View Post
Is there a tire size that will substitute for a 255-80R-22.5? Michelin seems to be the only manufacturer making that exact size. I'm not sold on the Michelins for our Discovery 37G. (Frankly, have heard some horror stories about Michelins and blowouts.)


Thanks,


Mel
I'm kind of in the same boat. I have the same tire on my 24K chassis Bounder, age wise I need to be looking next year. I'm sure I could go to 235/80R/22.5 and still have more tire than I need. Here is a tire calculator you can play with if you want to play with "truck tire" sizes, I will be looking at that eventually. Tire Size Calculator I'm the first to admit I don't get the whole RV tire gimmick.
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Old 04-22-2015, 08:27 PM   #3
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Substitute size for 255-80R-22.5?

Forget the inaccurate tire calculators. Look at the tire manufacturers' specs.

Michelin 255/80R22.5 is 542 revs/mile
Goodyear 265/75R22.5 is 537 revs/mile
Goodyear 275/70R22.5 is 548 revs/mile
Michelin 275/70R22.5 is 545 revs/mile

These tires are all so close in size as to be interchangeable, IF mounted on the correct wheels so that they do not come in contact with the bodywork, chassis, or (in the case of duals) each other. They come in various load ranges from several manufacturers.

My OE tires were the Michelin XRV in 255/80R22.5 G on 7.5" wheels. I replaced them with Michelin XZA2 Energy in 275/70R22.5 J on the very same 7.5" wheels. The rear tires are a bit closer to the wheel openings than the OE tires, but still have adequate clearance to the fiberglass. If I changed to 8.25" wheels, I'm pretty sure I would have to trim the rear wheel opening to avoid tire contact with the body.
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Old 04-22-2015, 08:40 PM   #4
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Just be sure the new tires have the same or greater weight carrying capacity and don't "kiss" at the duals. I went to 305/70's on the front of our previous Dutch Star because I need the capacity. They cleared everywhere but turning with the air down.
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Old 04-22-2015, 10:37 PM   #5
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Quote:
Originally Posted by slowmachine View Post
Forget the inaccurate tire calculators. Look at the tire manufacturers' specs.

Michelin 255/80R22.5 is 542 revs/mile
Goodyear 265/75R22.5 is 537 revs/mile
Goodyear 275/70R22.5 is 548 revs/mile
Michelin 275/70R22.5 is 545 revs/mile

These tires are all so close in size as to be interchangeable, IF mounted on the correct wheels so that they do not come in contact with the bodywork, chassis, or (in the case of duals) each other. They come in various load ranges from several manufacturers.

My OE tires were the Michelin XRV in 255/80R22.5 G on 7.5" wheels. I replaced them with Michelin XZA2 Energy in 275/70R22.5 J on the very same 7.5" wheels. The rear tires are a bit closer to the wheel openings than the OE tires, but still have adequate clearance to the fiberglass. If I changed to 8.25" wheels, I'm pretty sure I would have to trim the rear wheel opening to avoid tire contact with the body.
Very helpful. Thanks.
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Old 04-23-2015, 12:47 PM   #6
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I replaced the 255 80R 22.5 with Continental HSR2s in the 10R22.5 size. My speedometer reads 3 MPH lower than actual speed now. No biggie.
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Old 04-24-2015, 11:29 AM   #7
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On my previousMH I replaced the 255/80R22.5 with the 265/75R22.5's Toyo's. Worked great.
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Old 08-08-2015, 10:47 PM   #8
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Dennis K got it right....Toyo's were by far the best option after weeks of research on my part. Went from Michelin 255 80R 22.5 to 265 75R 22.5 . No change in MPH, better tire, a bit wider. All fit and works great.
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Old 08-08-2015, 11:13 PM   #9
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Substitute size for 255-80R-22.5?

Quote:
Originally Posted by MPH View Post
Is there a tire size that will substitute for a 255-80R-22.5? Michelin seems to be the only manufacturer making that exact size. I'm not sold on the Michelins for our Discovery 37G. (Frankly, have heard some horror stories about Michelins and blowouts.)


Thanks,


Mel

Hi Mel,

I don't know who told you Michelin had 'discontinued' 255/80R/22.5 tires, but they are WRONG.

Two weeks ago I ordered 6 Michelin XRV 255/80R/22.5 tires and they were installed last week. I love 'em. They were manufactured late June, 2015, less than a month old.

Amazing the amount of wrong information on the Internet.

Been riding Michelin's on at least 20 different vehicles the past 40 years. Never a blowout, not even a flat tire, just a great ride.

Next time check here:

www.simpletire.com
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Old 08-08-2015, 11:28 PM   #10
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Hi Mel,

I don't know who told you Michelin had 'discontinued' 255/80R/22.5 tires, but they are WRONG.

Two weeks ago I ordered 6 Michelin XRV 255/80R/22.5 tires and they were installed last week. I love 'em. They were manufactured late June, 2015, less than a month old.

Amazing the amount of wrong information on the Internet.

Been riding Michelin's on at least 20 different vehicles the past 40 years. Never a blowout, not even a flat tire, just a great ride.

Next time check here:

www.simpletire.com

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Old 08-08-2015, 11:32 PM   #11
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Old 08-08-2015, 11:34 PM   #12
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Old 08-08-2015, 11:41 PM   #13
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While at the tire center I also saw THESE: 'Nuff Said,

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Old 08-09-2015, 08:46 AM   #14
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On my previousMH I replaced the 255/80R22.5 with the 265/75R22.5's Toyo's. Worked great.
I did the same on my fronts. Will go with 265/75R22.5 Toyo's 154's when rear need replacing.
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