The tyre is a hoop of steel that is fitted around the steel wheel centre and a groove on inside diameter of a flange face. The diameter inside is machined to be slightly less than the wheel diameter at the centre on which it is mounted to give an interference fit.
The tyre is fitted by heating to a controlled temperature avoiding overheating,this causes the tyre to expand.The wheel centre usually mounted on the axle is lowered into the tyre which is flange side up. the tyre cools and the retaining ring is fitted into the groove down on the retaining ring.
The tyre is primarily held in place by its interference fit.The shoulder on the outside and the retaining ring also keep the tyre in place if interference fit is lost.
mark juma answered the question on May 19, 2018 at 12:55
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