Correct answer
Through the rigid metal ring inserted into its bead.
The tyre seats on the rim through its beads, reinforced with steel rings that secure the fit. Attachment also requires compatible tyres and rims in good condition and correct pressure; the ring is not a guarantee against every separation. The shoulder is at the edges of the tread and the sidewall is the lateral wall: neither is the bead reinforcement asked about.
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Through the lateral rigidity of the sidewall.
Through the bulged profile of the shoulder.
Through the rigid metal ring inserted into its bead.
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