Answer Posted / sridhar

Reasons for Having so is
1)Tractor needs Tractive force with low speeds which is
meant for soft terrains.
2)Since the Coefficient of friction between tyre and
surface contact is low in order to overcome this,tractor
produces high tractive force with low speed.
3)For steering stability and power consumption the front
wheel is designed small size.
4)Torque=Force * Distance(T=F*R) by keeping Force constant
and increasing Distance between Wheel axis and force
applied will increase torque which is desired

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