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This is a tire question. I purchased a 1970 35" flxible transit bus from a church. It has two different size tire on the rear. One side has 22.5 duals and the other is 1000-20 duals. Which one is correct size. Thank you.
The 10.20 is the old size {usually} bias ply tire.
The 22.5 is thw newer size.
You should check the year of Mfg. and toss any that are over a decade old.
And be sure to check they all are the same diameter, or the largest will get most of the weight.
With enough phone calls I was able to find new, steer , 22.5 for $230 each, mounted with tax.
If the coach is too slow it is also done to find 24 inch wheels and gain 3 or 4 mph on top speed , but this is expensive , and heavy lifting.
BE sure to advise the "tire guy" if the coach has left and right lug nuts , coaches do trucks usually dont .
STOOPID tire guys will break every stud off with their 1000 lb air wrench.
TORQUE the lug nuts on YOURSELF ,
yes it costs $200 + for a used 600# torque wrench , but the problems avoided cost way more!