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I started checking my tires before each ride with a digital tire gauge and brass presta-to-schrader adapter and I found something similar. It only takes 10 psi to go from a springy pneumatic ride to one that rattles the shifters over every bump. For me the magic numbers are about 90r/80f on 23c tires Schwalbe Ones and 70r/65f on 28c Hutch sectors. I'm 175lbs riding on the carpet-bombed streets of Seattle.
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