1981 Suburban with original wheels and FFS feels like riding in deep sand -- is there a solution?

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Schwinny

Wore out three sets of tires already!
I recently found a cache of MSW thunder road tires in 630 ISO. A standard road tread, not racing.
Tan wall and 120 psi max on the sidewall.
I don't know anything about them other than Taiwan made, but going to swap out a set on my old speedster and see the difference between 85 psi tires and 120.
 
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