Xeric Halwende

Tractor means (traction + motor) as the name itself says, the rear wheels are made for traction and 
stability from slipping , so as the application in farm, dozer i.e., in where the soil is loose, heavy bumps with ups and downs. To maintain stability in such case, traction is required, and not to get stuck in these cases, Torque is required. T= F.r Larger the wheel size is, then larger the area of impression, hence smaller the force on loose soil which helps
the wheels not to get into the ground.                                                                                                                                                            The front wheels are small, for steering ( turning ) the vehicle...if the front wheels r big it will be very hard
for the driver to steer it....Thus the actions of the front/rear wheels are distributed by its design.

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2.3 log (T₁ / T₂ ) =  μ.θ