Spur gears have straight teeth and are parallel to the axis of the wheel. Spur gears are the most common type of gears. The advantages of spur gears are their simplicity in design, economy of manufacture and maintenance, and absence of end thrust. They impose only radial loads on the bearings.
Spur gear teeth engagement will not be gradual but also one tooth of driving gear will mesh with tooth of driven gear each time and will produce noise and also deliver the impact load over the meshing teeth.
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Therefore spur gears are not preferred in driving mechanism of vehicle such as car. Helical gears are used in driving mechanism of vehicle in order to reduce the impact loading, noise and stress on gear teeth.

There are two types of spur gears used in industries i.e. external spur gear and internal spur gear. In case of external spur gear, teeth will be cut over the outside surface of cylinder with parallel to the axis.

In case of internal spur gear, teeth will be cut over the inside surface of cylinder with parallel to the axis.
In order to secure the uniform motion and transmission of power between drive and driven member, surface of tooth of spur gear teeth will have an involute profile.

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