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Open Roads Forum  >  Class A Motorhomes

 > 8R17.5 Tires

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lacollins4

orange county,ca,USA

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Posted: 02/15/10 10:19am Link  |  Print  |  Notify Moderator

Hi,
We have a 1979 Winnebago with 8R17.5 tires and just noticed some have some cracks near the hub running around the tire. I see only one manufacturer who still makes the tire. Should I replace with same size tires or should we change rims and tire size? and if so, do you know what size rim could be interchanged.
Thanks


1979 Winnebago Brave 27ft Bunk House


Artum Snowbird

Campbell River, B.C., Canada

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Posted: 02/15/10 10:58am Link  |  Print  |  Notify Moderator

There is a lot written on the age of RV tires and how safe they are. Living in the sunny area of the US can really make those tires very unsafe. There is a set of numbers that you can see on the tires, and a Google search will tell you how to find the age from the last digits of the serial numbers.

I think it's three or four digits at the end... either one or two for the month, and two for the year, but I might be wrong.


Mike and Carole
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previously 8'10" Snowbird Camper
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bsinmich

Holland, MI

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Posted: 02/15/10 11:23am Link  |  Print  |  Notify Moderator

Up to the year 2000 the tires were marked with 3 numbers. The first 2 were the week and the last was the year. As of 2000 there are 4 numbers with 2 for week and 2 for year. You can see the problem with the 3 digit. If the 3 numbers are 269 it would be the 26th. week of '79; 89; 99. On a real old tire you could be off by 10 years with no difficulty. These numbers are after the DOT letters and the last of the rows of numbers and letters. The date is only put on one side of the tire so you may have to look hard to find it.


2003 Newmar Mountain Aire, Workhorse W22, 2008 Saturn Vue, Falcon 5250, & US Gear Unified Tow Brake

pianodan

Pine River, MN, USA

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Posted: 02/15/10 11:41am Link  |  Print  |  Notify Moderator

If the 17.5 tires are on split rims (I think they are), you'll need to upgrade rims as well as tires. I know the 17.5s are real difficult to find now, so you'll probably end up spending quite a few bucks upgrading. Just a thought here, are you sure they are 17.5s? I know a friend that has an "eyebrow" model 60's Winnebago Brave and that's what his wears, but I was thinking they went to 19.5 tire size by '79.


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dsr27

SF Bay area

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Posted: 02/15/10 01:44pm Link  |  Print  |  Notify Moderator

Kuhmo, Bridgestone, and Yokohama still make the 8R17.5's I was surprised to see that Michelin has dropped them. I ran my first set for 10 years without any problem.

These guys show some of the off brands as well.
Gary


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lacollins4

orange county,ca,USA

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Posted: 02/15/10 07:07pm Link  |  Print  |  Notify Moderator

They are 17.5's and definitely in need of replacement.
Thanks dsr27 for the link to the tire place. I did see there are still some manufacturers that make them.
THANKS!

BigRabbitMan

Cottage Grove, OR

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Posted: 02/15/10 08:10pm Link  |  Print  |  Notify Moderator

When it becomes time to get them mounted, you will have to go to a truck tire facility as the automotive places generally don't have the cage that is needed when first airing them up. No big deal.


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