lower pressure more traction, but better chances of pinch flatting. higher pressure, faster rolling, less traction, less chances of pinch flats. too low, you might find some handling issues around corners and such. trial and error! its all preference.
it really depends on the conditions where you ride..i prefer a higher pressure because it decreases flats, gives less rolling resistance and other things mentioned before...traction is the only real reason i can think of for riding low pressure...but im sure theres others
but for most riding conditions i would keep it at a higher pressure in less you ride in an area that requires that extra traction
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