Earthmoving equipments such as dump trucks, graders, wheel dozers, front end loader and water sprinklers are equipped with various sizes of tubeless tyres. These tubeless tyres are inflated up to 120 psi air pressure. These tyres are mounted on five piece rim assembly on which there is a provision of O ring which helps retain the air pressure inside the tyre. These O ring are designed for a minimum 350% of elongation at break and gives excellent resilience properties.