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Old 09-09-2009, 08:40 AM   #1
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Hi, I am a newbie here, maybe there is a thread already for this topic, I did not see it if so.
I have to buy new tires for my mtor home I have the 255/80 22.5 michelin tires on it now. Have found out a year ago that finding that tire when on the raod is very difficult. Unless you can sit for several days while one get shipped in from the coast.
So wondering about going to 255/70 22.5 tires. I was told that I may have to change wheels if I changed to that size. Is that true? Because of spacing for the duals.
Have priced out a brand I never heard of before Hankook? Ever heard of it????
Okay, would like to hear responses ASAP.
Les in sunny, hot Peoria

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Old 09-09-2009, 08:47 AM   #2
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Hi Les,
Welcome to iRV2. Instead of changing size tires, consider purchasing a spare tire (just the tire). Store the unmounted tire in the part of your basement that gets little access. You can put stuff inside the tire and in the middle of the tire. This way the tire itself takes up little room.

My recommendation is to stay with the size tire that came on the coach. I use Michelin tires exclusively, since 1965 (or there abouts). If you look at the cost over ten years, the annual cost of Michelin tires is not that great. For me, tires is not something I will compromise on.

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Old 09-09-2009, 08:48 AM   #3
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Check the oveall diameter of the replacement tire you choose if you change size. Your speedometer accuracy may be affected. The 265/75R 22.5 is the tire closest to the 255 in revolutions per mile that I have come across. Depending on the wheel you currently have, a change may be necessary. The 8.25x22.5 wheel is commonly used with most truck sized tires.
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Old 09-09-2009, 12:41 PM   #4
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255/80R22.5 and the 255/70R22.5 are the almost same width. Loaded width is 11.2 and 11.4 respectively(the variation is within industry RMA standards) and varies from manufacturer to manufacturer. They would fit the duals fine. BUT it is a much shorter tire, about 1.5".

IMHO the tire person you talked to is getting the aspect ratio confused with the width of the tire. It happens a lot.

The width of the tire is "255" mm. The height of the tire is the % of the second number (aspect ratio).

Here is a formula that will ballpark any tire size(again within industry standards)

Example: 255/70R22.5

1. 255 x 70%=178.5 mm (height of the sidewall in mm)
convert mm to inches by the following
2. 178.5mm/25.4mm/inch=7.03 inches
3. 7.03 x 2 (top and bottom sidewalls)=14.06
4. 14.06 + 22.5(wheel size)= 36.56 inches tall
5. 255mm / 25.4 mm/inch = 10.03 inches wide unloaded

If you change sizes, be sure to check that the maximum load carrying capacity is equal to or more than your OE tires.
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Old 09-09-2009, 01:41 PM   #5
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I believe that tire is made in China. I have just bought a set of Goodyear RV tires to replace a set of Michlin tires. I could not get any fresh Michlin tires without a long long wait. The Goodyear tires are made in the United States and were only six months old. They seem to ride and handle like the Michlin tires that I had. I replaced them because they were eight years old and had dry cracking on the sidewalls.
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Old 09-09-2009, 02:03 PM   #6
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Originally Posted by boatracer2 View Post
I believe that tire is made in China.
HANKOOK Tire is a South Korean company.

The Hankook Tire group, based in Seoul, South Korea is the seventh largest tire company in the world [1]. Established in 1941 as the "Chosun Tire Company", it was renamed "Hankook Tire Manufacturing" in 1968.
Hankook Tire's worldwide reputation has largely grown due to its radial tire and bias-ply tire production. The company now supplies tires as original equipment to the Toyota Motor Corporation, Ford Motor Company trucks, General Motors trucks, International Truck and Engine Corporation, and others. In addition to producing about 50 million tires per annum, the company also sells batteries, alloy wheels, and brake pads.
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Old 09-20-2009, 02:35 PM   #7
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Hankook is not a bad tire, but it isn't a Michelin.

The 255/80's that came on our Vectra were marginal on load specs. We upgraded to a 275/70 LR J XTA2 . They actually corrected the small speedometer / odometer error that we had, improved the ride (lower inflation pressures), and slightly helped the fuel economy.

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