Air seeps out of bicycle tire at a rate of about 15 to 20 pounds per week. So in 2 weeks, your tires could be 40 lbs low. Keeping your tires at the proper pressure is routine. You’ll expect this loss of air and will need to plan for it. Many cyclists air their tires at every ride, thereby never needing to add much air. Others, particularly after a long intermission, will need to put 50 or more pounds of air into their tires. A high quality pump makes this job easier. And if it’s easier, it’s easier to keep your tires at their correct pressure.
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