THe 1/24 "dub city" replacement wheels come out to about 18-19" wheels in 1/18. They are thin , but you can use some of the thicker tires off of a Burago or Maisto(etc) to make it look better.
For an H2 , you might as well use the 1/18 wheels . The 1/24 wheels would look too small on it. Theres a couple on Ebay that might give you an idea of what it'll look like -
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