You can’t run chain drives to the front of a bike very easy. A direct drive on a bikes front wheel would work but the motor would have to be very small so not much power from a gas motor. Other options rub on the front wheel to power them, still has to be small.
There are new electric bike motors that fit between the forks and are also the front hub.
Cars just have more room for bigger engines and a more complicated mechanism for turning and driving.
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