There are two main types of steering gears used for most modern vehicles:
the rack and pinion steering gear and
the recirculating ball steering gear.
In most cars, small trucks and SUVs on the road today, there is a rack and pinion steering system. This converts the rotational motion of the steering wheel into the linear motion that turns the wheels and guides your path.
The system involves a circular gear (the steering pinion) which locks teeth on a bar (the rack).
It also transforms big rotations of the steering wheel into small, accurate turns of the wheels, giving a solid and direct feel to the steering.

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