Question

Why are the rear tyres of tractors are broader

Answer 1

Rear tyres of tractors are broader so that there would be increase in contact area due to which there would be increase in friction which helps the tractor to maintain its balance without skidding on muddy tracks even.
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Answer 2

rear tyres are broader to produce more friction
between tyres and ground due to broader tires force acts on larger area which will help them to move in difficult terrain.