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Continue to ChatRacing Ralph is directional and has 50psi min pressure https://cycletechreview.com/2013/reviews/schwalbe-racing-ralph-cyclocross-tyres/attachment/racing-ralph-is-directional-and-has-50psi-min-pressure/
Racing Ralph is directional and has 50psi min pressure https://cycletechreview.com/2013/reviews/schwalbe-racing-ralph-cyclocross-tyres/attachment/racing-ralph-is-directional-and-has-50psi-min-pressure/