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Braking
for better traction!!
In front wheel drive the traction comes from the front wheels while in rear wheel drive traction power comes from the rear wheels.
They are broader for better traction.
On most cars the handbrake is applied to the rear wheels only. The footbrake applies to both the front and back brakes, with a bais to the front to help avoid the rear wheels locking up under heavy braking.
Rolling wheels have more traction than sliding wheels. Thus you have more control. To illustrate; If you were in a turn and either locked the brakes or accelerated too fast the rear wheels loose traction and the rear of the car starts to pass the front of the car.
There are several words for wheels losing traction; spinning, sliding, drifting, breaking free... If it happens to the front wheels while cornering it'll cause understeer = the car will continue straight forward despite the driver trying to turn.
Some farm tractors that have small wheels in the front and larger wheels in the back is to help farmers pull larger equipment. The large tires have more traction and the smaller wheels help to steer.
For rear drive cars - it's called a fishtail. You brakes work better on the front. Anybody who sailed over the handlebars when braking just the front wheel on a bike is called a head plant, (ouch)
Chevy done that on 4-wheel drives so when your off road with it the rear wheels are always grabbing a couple inches of un touched ground where the front wheels did not touck. That is called tracking. It's so the rear wheels don't run in the same place that the front wheels run. Better traction.
For rear drive cars - it's called a fishtail. You brakes work better on the front. Anybody who sailed over the handlebars when braking just the front wheel on a bike is called a head plant, (ouch)
The small front wheels allow the wheels to be turned in the alloted space. Additionally, the front axle is a dead axle - it does not drive the machine - so the need for traction and weight distribution on that axle is much less than it is for the live (rear) axle.