Originally Posted by ViewRVs
So - How many ply do I need? What are others doing if the 8R 19.5 are going away, and is there an issue with the space between the rear tires - how much should I have - no specifications I can find anywhere?
you need as many plies as it takes to create a tire with a Load Rating sufficient to carry the vehicle.
what does the manufacturer’s plate say that your axles are rated for?
note that the same tire on a single wheel axle (front, or steer, or tag) will have a different weight rating than for a dual wheel axle (rear, or drive) at any given tire inflation pressure.
you have to do the math, along with the manufacturer’s tire specification page to see if your potential tire selection “fits” the wheel you’re using. (it will tell you the correct wheel size.)
if you google “Bridgestone tire inflation chart” (pick your own favorite brand) you’ll directly or indirectly get to results like this one - http://www.trucktires.com/bridgeston...loadTables.pdf
then, if the tire physically fits, does it financially fit?
in a similar situation, we recently swapped out six 9.50R16.5 tires with a complete new set of 16x6 wheels and LT225/75R16 tires. expensive, but worth it, considering the eventual unavailability of 16.5 tires. they do ride pretty nicely….
others more experienced with the 19.5s might be able to advise you better as to your alternative wheel & tire sizes.
I would only otherwise suggest that you deal with a “truck” tire dealer rather than one oriented to “automobile” tires.