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Old 11-11-2017, 06:41 PM   #1
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Quick Tire Question

when I bought my '99 Tradewinds last year it had a set of 245/75R 22.5 Yokohoma's on it...ran fine, no problems. As winter approaches I decided to put some new Toyo's (same size ) on it before putting the MH in the warehouse. Was just perusing a Tradewinds manual on-line and noticed they came from the factory with 235/80R 22.5 on it.
What's the difference? I KNOW that sounds like a dumb question...sorry.

Thanks in advance,
Jonathon
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Old 11-11-2017, 06:54 PM   #2
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I believe the 235/80R 22.5 is strictly a Michelin tire size!
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Old 11-11-2017, 10:45 PM   #3
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Our '99 Tradewinds also came with 235/80 Michelin tires. Another '99 TW owner recommended the Toyo M154 265/75 tires. My pick was the Toyo M154 245.75 but our RV dealer suggested Sailun S637 tires and we ended up with Sailun S637 255/70 tires.
We've put 14,800 miles on them in two year and have been happy. They also have a higher load rating (H) than the Michelin tires (G), they also have a higher speed rating (81 vs. 75).
To answer your question, the Michelin 235/80 is slightly larger in diameter than the Yokohoma 245/75. In revolutions/mile the 235/80 turns 556 Rev/M and the 245/75 is 561 Rev/M. The 255/70 we purchased is almost the same as the Michelin 235/80 with a Rev/M of 552.
Hope this helps.
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Old 11-12-2017, 03:45 PM   #4
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Quote:
Originally Posted by jonathon51 View Post
when I bought my '99 Tradewinds last year it had a set of 245/75R 22.5 Yokohoma's on it...ran fine, no problems. As winter approaches I decided to put some new Toyo's (same size ) on it before putting the MH in the warehouse. Was just perusing a Tradewinds manual on-line and noticed they came from the factory with 235/80R 22.5 on it.
What's the difference? I KNOW that sounds like a dumb question...sorry.

Thanks in advance,
Jonathon
I just put on a set of Yokohama 245/75/22.5 this summer. They are a few tenths of an inch shorter but wider than the Michelins. I also believe they are a better tire, I'm not a Michelin man. My speedo is still right according to my GPS at 70 mph.
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Old 11-12-2017, 04:19 PM   #5
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The difference is in the overall size of the tire:
The first number is the tread size in millimeters.

The second number is the sidewall width (ratio):
235*80%=188mm
245*70%= 171.5mm

The R = Radial design.

The third number is the rim (wheel) size = 22.5"

See:
RV Tires 101 | www.trailerlife.com

Hope that helps
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Old 11-12-2017, 04:41 PM   #6
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tire question

thanks for all of the replies regarding my Tradewinds and its tires....went with the 245/75R 22.5 @ $220 per tire plus mounting. Has anyone used the "balancing beads on the steers?
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Old 11-12-2017, 07:06 PM   #7
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Quote:
Originally Posted by jonathon51 View Post
thanks for all of the replies regarding my Tradewinds and its tires....went with the 245/75R 22.5 @ $220 per tire plus mounting. Has anyone used the "balancing beads on the steers?
I used beads in all my tires. Smooth is all I can say, even in the rear. I've always balanced all my tires, even on my trailers.
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Old 11-13-2017, 07:12 PM   #8
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I went with the M154 Toyo's 245s in June. Have used beads for many years and was very happy until the last month. Tires and beads were new in June. I developed a terrible out of balance condition on the fronts. Had to have the tires broke down and gum from beads removed. Back tires did not gum and run smooth. I know somebody will point out that moisture will cause gum up. I had never added air to the tires. Never had a gum up issue in 17 years until this fall. Place where I purchased tires could not come up with a cause either. Tires were the smoothest I had ever run on the MH until the gum up issue.
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