What does the ply rating of a tractor tyre indicate?
The strength and load-carrying capacity of the tyre
The ply rating is a code that describes the construction strength of a tyre rather than its physical dimensions or tread design.
It historically referred to the number of fabric layers (plies) built into the tyre casing; more plies mean a stronger casing.
This directly determines how much load the tyre can safely carry and how much internal pressure it can withstand.
It does not describe tread pattern, tyre size, or the required inflation pressure, which are separate specifications.
Hence, the answer is the strength and load-carrying capacity of the tyre.
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