Question

Why do trucks have double tyres at the back

Answer 1

Buses and trucks have double wheels at the back because these are heavy vehicles with most of the loads resting towards the back. Also, the engine that drives the vehicle is attached to the back wheels so the double back wheels provides better hold on the ground. Double wheels are not used in the front since that would make the steering uncomfortable.

Answer 2

The trucks have double tyres at the back in order to maintain the heavy load of the truck. The large part of the weight of the truck is on the rear axle. In order to maintain balance, double tyres are used. Also, the double tyres help to increase the cross-section area which decreases the pressure. It helps in providing a better hold on the ground.