Editing Slip angle (section)

== Measurement of slip angle ==
There are two main ways to measure slip angle of a tire: on a vehicle as it moves, or on a dedicated testing device.

There are a number of devices which can be used to measure slip angle on a vehicle as it moves; some use optical methods, some use inertial methods, some [[GPS]] and some both GPS and inertial.

Various test machines have been developed to measure slip angle in a controlled environment. A [[motorcycle tire]] test machine is located at the [[University of Padua]]. That uses a 3-meter diameter disk that rotates under a tire held at a fixed steer and camber angle, up to 54 degrees. Sensors measure the force and moment generated, and a correction is made to account for the curvature of the track.<ref name="Cossalter" /> Other devices use the inner or outer surface of rotating drums, sliding planks, conveyor belts, or a trailer that presses the test tire to an actual road surface.<ref name="Pacejka" />