A slick tyre (also known as a "racing slick") is a type of tyre that has no tread, used mostly in auto racing. The first production "slick tyre" was developed by M&H Tires in the early 1950s for use in drag racing. By eliminating any grooves cut into the tread, such tyres provide the largest possible contact patch to the road, and maximize traction for any given tyre dimension^{[citation needed]}. Slick tyres are used on road or oval track racing, where steering and braking require maximum traction from each wheel^{[citation needed]}, but are typically used on only the driven (powered) wheels in drag racing, where the only concern is maximum traction to put power to the ground^{[citation needed]}.

Slick tyres are not suitable for use on common road vehicles, which must be able to operate in all weather conditions. They are used in auto racing where competitors can choose different tyres based on the weather conditions and can often change tyres during a race. Slick tyres provide far more traction than grooved tyres on dry roads^{[citation needed]}, due to their greater contact area but typically have far less traction than grooved tyres under wet conditions^{[citation needed]}. Wet roads severely diminish the traction because of aquaplaning due to water trapped between the tyre contact area and the road surface. Grooved tyres are designed to remove water from the contact area through the grooves, thereby maintaining traction even in wet conditions.