Tire pressure

Then This Happened Issue #2710
A four-panel comic about a person taking their bike to put air in the tires
A four-panel comic about a person taking their bike to put air in the tires - Panel 1
A four-panel comic about a person taking their bike to put air in the tires - Panel 2
A four-panel comic about a person taking their bike to put air in the tires - Panel 3
A four-panel comic about a person taking their bike to put air in the tires - Panel 4
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A four-panel comic about a person taking their bike to put air in the tires

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Creator's Notes

Why is it that I rode my bike all summer and the tire pressure seems fine. But when I pull it out of storage in the spring each year, the tires are always flat.