High pressure tires also referred to as “primos", "clinchers", and "court tires". are narrower than the everyday pneumatic tire. The tread pattern is minimal and not as deep as an everyday pneumatic.  While the Shrader type air valve is the most commonly used valve in the United States, a number of the high pressure tires use the Presta valve which originated in Europe. A converter is required so that they can be filled from a conventional pump with a Shrader type fitting. High pressure  tires require greater inflation, 90 - 110+psi as opposed to 65psi for the everyday tire. Many of the manufacturers anticipate these tires being used with increased wheel camber and have designed the tread to be off center so as to maintain surface contact.