sidewall

Etymology

From side + wall.

noun

The side of a tire.“If the puncture had been in the tread I could have had the tire patched, but it was in the sidewall and they can't fix that: they have to replace the whole tire.”
The wall forming the side of a structure; a side wall.
The wall forming the side of a structure; a side wall.; The wall forming the side of a racquetball court.“The kill shot may also be used against balls weakly played off the sidewall”