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When you buy road-type tires, take note of the maximum pressure on the sidewall. Some have a max of 50psi, compared to, say 75psi for others. If you can run your off-road tires at a higher pressure, the difference in performance won't be so great.
That said, good road tires have a lower rolling resistance and they'll usually be narrower, of course, which also helps. I used 50psi road tires (26X1.9 I think) for our recent long ride and they were fine, but I'd ridden it on some fatter knobbly tires at higher pressure and it felt fast then, too.
It was a borrowed bike, so I'm afraid I can't remember what tires they were!
Roy
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