Bicycle Tire Pressure?

A

Andy

New member
I was just wondering what the different tire pressures are for on the side of a bike tire. For example on the side of my bicycle tire it says 25 - 50 PSI. Is the 25 PSI for riding on soft surfaces and the 50 PSI for harder surfaces like roads? Please could somebody tell me as I need to know, Thanks Also for everyday normal riding what pressure should it be, and what should the tire pressure be for XC racing? Thanks again
 
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