Air inside a tire pushes out on the tire walls and holds the tire up. The sidewall shows the safe pressure range, and a grown-up checks it with a gauge.
17 blocks · 3 graded
16 blocks · 3 graded
18 blocks · 5 graded
15 blocks · 4 graded
16 blocks · 4 graded
11 blocks · 2 graded
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