Automobile Engineering in ME
In bias ply tyres

All of these
Belts of steel mesh are used in the tyres
One ply layer runs diagonally one way and another layer runs diagonally the other way
All plies run parallel to one another

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Automobile Engineering in ME
In radial tyres

All plies run parallel to one another and vertical to tyre bead
Inner tubes are always used
One ply layer runs diagonally one way and another layer runs diagonally the other way
None of these

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