Correct answer
The sidewall.
It is the sidewall, the tyre’s lateral surface. The tread is the outer surface contacting the road; the bead seats and secures the tyre on the rim. The bead is not a joint between the tyre casing and the tyre itself. This question concerns the lateral surface, although the picture also includes some tread and rim.
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The sidewall.
The bead.
The tread.
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