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I like the test but want to point out it isnt true if the transition from hill to flat is noted. a better test would have been by a preset mph coast down.
the 20 psi tire is going to nearly bottom out the rim on any more than a 10 deg. angle and thus loose much of its potential at bottom of ramp.
but we all do know that a harder tire should roll easier.
just dont over air your cheap tires as they break cords and get sidewall blisters.
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