Answer / kevin

I am sure that there are multiple reasons, but the main
reason the smaller wheels are in front are because they are
for turning. The rear wheels are made for traction and
stability, thus their size.

Answer / bala10286

as the radius of the wheel increases the torque also gets
increases....the front wheels are for steering the
vechicle...if the front wheels r big it will be very hard
for the driver to steer it....

Answer / mahesh lakhani

Tractor means (traction + motor)so in case of tractor the
requirement of torque is much higher then the other
vehical, as the application where the vehical uses farm,
off-road application dozer and loder, so it needs high
torque in driver wheel to prevent the machine to get slipe.

in tractor there are few speed reduction stages like
transmission, differentail, and final reduction (with bull
gear or planetory) thru bigger tyre can increse the contact
area with soil, which help to increse torque as the torque
(T= r(is the displacement)* f(is the force vector)

Answer / vedant

its not only a case of tractor, but for max. vehicles.
Basically driver wheel is always kept larger than the
driven where all-wheel-drive is not used. Driver wheel is
larger to utilize and conserve torque, as larger the wheel,
more the M.I. ,hence it can attain rotation for longer
duration. But as front wheel is not powered instead it is
just pushed, its M.I. should be less so that it can be
easily rotated,and thus less power is wasted in moving the
wheel. hence to keep MI low, it is of lower size. thats
it

Answer / k l senthil kumar

Tractors are mainly used for farming purposes where the soil
is loose.
When the driven wheel (rear wheels in tractor) exerts
pressure on the ground the force applied on the ground
depends on the area of inpression the wheel makes on the ground.
Larger the wheel size is, then larger the area of
impression, hence smaller the force on loose soil whch helps
the wheels not to get into the ground.

Answer / ram krishan singh

many resons for making small tyre in front of tractor
1. it reduce some aerodynamics resistance
2. steering stability
3. driving comfort
4. traction control
5. torque transmission

Answer / shashi bhushan

rear wheel having garater traction force,hence for easier
stearing we provide smaller wheel on front wheel

Answer / manish

The rear wheel needs more friction for traction purposes so
they are large but front wheels are only for stirring
purposes so they are small.

Answer / rockyfire

rear wheel is needed for producing maximum traction i.e.
grip on the ground therefore its area should be more.In
addition to this fact,it is also imp to give max torque and
min speed which is possible only when the size of the wheel
is large.On the other hand,front wheel is only used for
steering purpose so it's size should be kept small.

Answer / aashish pathak

its because many factors responsible for this such as:
1. in farms the friction between soil and tyres is much
higher, the big tyres reduces sliding.
2. the weight of the tractor lies backside.
3. to make turning front tyre get easily turned.
4. it require maximum torque transmition.
5. larger the size of wheel reduces slipping because of
larger grooves.

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