Answer / devineshop

Tractors have big rear tires because ,the larger the surface
area of the tractor's wheels touching the ground, the more
pulling power you have. Like how tractor pullers have large
tires.

Another reason is that the tractor doesn't have to operate
at a higher speed to get the same ground speed with larger
tires. Gear ratios don't have to be as high b/c of the
larger tires.

Answer / moninder

Because tractor operates at lower rpm and higher torque

Answer / vaisakh.v

When speed decreases, torque increases.
That's why the back wheel of tractor kept larger.(to achieve permanent speed reduction)
And also to overcome slippery surface.

Answer / hariharan

For easy controlling the vehicle during turning, while
carrying heavy load .

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