The Radial Ply TyreChances are your car is fitted with either radial ply tyres or crossply tyres. Radial tyres have the word “Radial” on their sidewalls. Otherwise the letter “R” will appear in their size markings,. Eg. 175/70R13 82H. Structurally, you can differentiate a radial tyre from a crossply tyre by (1) the position of its plies and (2) the presence of breakers.