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Old 05-16-2013, 03:12 PM   #1
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8R19.5 to 225/70R19.5

Is this a problem? I will be in the market for new tires (2) next year. I would really hate to buy 6 tires.
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Old 05-16-2013, 06:33 PM   #2
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Only if they are all original equipment, Michelin gives 8 yrs before they say they should be replaced, one of my original equipment tires on the rear blew, so replaced 4 figuring I would wait a couple of years to do the newer fronts, this year I did the front and best price out of Ohio supplied 2 yr old tires, so I should have just replaced them all at the same time. They couldn't to be found in Florida, and I did want to match them by brand if not age.
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Old 05-17-2013, 12:17 PM   #3
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Aren't they the same size?
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Old 05-21-2013, 05:46 AM   #4
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Hasn't anyone done this?
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Old 05-21-2013, 05:50 AM   #5
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Only if they are all original equipment, Michelin gives 8 yrs before they say they should be replaced, one of my original equipment tires on the rear blew, so replaced 4 figuring I would wait a couple of years to do the newer fronts, this year I did the front and best price out of Ohio supplied 2 yr old tires, so I should have just replaced them all at the same time. They couldn't to be found in Florida, and I did want to match them by brand if not age.
I'm not sure what you mean, I assume the wheels are OE.
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Old 05-21-2013, 06:23 AM   #6
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The 225/70R19.5 are a lower profile tire. If you switch you need to change all of them on an axle. Don't change the left side without changing the rights.
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Old 05-21-2013, 06:37 AM   #7
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8R19.5 to 225/70R19.5

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The 225/70R19.5 are a lower profile tire. If you switch you need to change all of them on an axle. Don't change the left side without changing the rights.
I changed to the 225/70R19.5 on my Classic Motorhome. They are 1" less in diameter than the original 8R19.5, since they are also wider I had to retain the original size on my tags due to insufficient clearance. This has not been a problem since it is only 1/2" difference in radius. My tire/alignment shop confirmed this being a non-issue.
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Old 05-29-2013, 01:41 PM   #8
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So when I go to the tandems I'll need to buy 4?
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Old 05-30-2013, 10:04 AM   #9
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Yes buy all 4 at once. Also remember the steer is the most important. Tag has very little weight on it.
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Old 05-30-2013, 06:41 PM   #10
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What do y'all think of the Goodyear G 647 ?
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Old 05-31-2013, 04:24 PM   #11
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The Goodyear is probably a good tire. I got Michelin XRV's from Sam's Club. Paid $2,800 for 8 tires. I picked the Michelin because I get over 100,000 miles on them on trucks at work running overloaded half the time.
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Old 05-31-2013, 06:17 PM   #12
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I run the Goodyear G647 because they are the only name brand 19.5 that I have found that are mud and snow rated. Around this part of the world that can come in handy.
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Old 07-10-2013, 08:26 AM   #13
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Arrow My thoughts

Going from 8R19.5 to 225/70R19.5 should not be a problem. Seems all here have told you of the size difference. Check your wheels to make sure they are in good shape when you make the switch. Wheels are far too often overlooked in inspections and maintenance. I recently bought a set of six tires for mine. I went with the Cooper tires. Quite a bit less expensive and so far the wear has been minimal. I buy them from a local dealer and have been very happy with my choice.
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Old 07-10-2013, 06:46 PM   #14
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I prefer Cooper for my car/truck. Which ones did you get?
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