Here's how I seem to have come out on my tire and wheel upgrade.
The wheels are Accuride P/N 28160 they are 22.5x6.75 and the tires are 10.00x20s they are 40" tall. The original tires and wheels where 8.25x20s and where 38" tall. The truck drives much better now and it seems to have picked up 1&1/2 to 2 miles to the gallon in fuel mileage. I think this is from a combination of going from bias to radials, the bigger diameter helping the gearing and a lighter tire and wheel combo.
The change was not cheep almost three grand but I use my truck for business and the improvement in reliability alone was a must and the fuel mileage and drive are an added bonus I am more than happy.
I didn't go 19.5s for two reasons one tire choice there aren’t as many tire available in 19.5 and two my 56 runs the same tires and that makes things easer.
