why the back wheel in the tractor is bigger than the front
wheel?

Answer Posted / 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

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