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badger_biker - the sidewall on mine says "80 psi", however because I'm light and not carrying anything I would typically run the rear around 75 & I always run the front 5 psi less, so 70 or so. Not an exact science, but I never run maximum psi & always 5 less in front. I had them on my '85 Bigfoot for awhile, then on the '88 Rockhopper. They seemed a little slow on the street, which is mostly where I rode them. They seemed good on packed dirt trails, but my experience on dirt/gravel isn't much, so I know that's not saying a lot. I sold those bikes, but I kept these tires.
They're normally around $50 per tire and I got them on sale for $25 per tire. Can't beat that, plus mine has the reflective stripe around the tire. I like that.
How do you like them so far?