Why would you want to change the size? The 10R22.5 is a widely used size on commercial trucks & trailers, so it generally very competitive priced and readily available wherever you may be. Most of the major ire manufacturers offer that size too.
The nearest metric size is 295/80R22.5 and that should fit nicely. Gives a bit more load carrying capacity too, but probably will cost you 25% more per tire. And few tire dealers will have a 295/80 in stock, so it's always a special order from the warehouse.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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