1.NounThe ring-shaped protective covering around a wheel which is usually made of rubber or plastic composite and is either pneumatic or solid.
"pneumatic tyres; runflat tyres"
2.NounThe metal rim, or metal covering on a rim, of a (wooden or metal) wheel, usually of steel or formerly wrought iron, as found on (horse-drawn or railway) carriages and wagons and on locomotives.
"iron tyres for the coach and iron shoes for the horse; tyres and rails of steel, and every axle with roller bearings"