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.
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
2009 Triple E F254SSXL Fifth Wheel
2005 16.6 Double Eagle
2000 F350 7.3 SC 4X4
previously Snowbird Campers
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.
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.
'91 FRED 35' Oshkosh Journey ('89 chassis)
'93 6BT5.9L Cummins 230 HP TC wastegated/intercooled,Allison 545 4 speed
'74 Jeep CJ6
'80 Suzuki GS850L
Pine River, MN