High Quality Content by WIKIPEDIA articles! Pneumatic trail and trail of the tire are terms used to describe the trail-like effect generated by compliant tires rolling on a hard surface and subject to side loads, as in a turn. Pneumatic trail is the distance that the resultant force of side-slip occurs behind the geometric center of the contact patch. It is due to the progressive build-up of lateral force along the length of the contact patch, such that lateral forces are greater towards the rear of the contact patch (though less so when the rear of the contact patch begins sliding) and this creates a torque on the tire. Since the direction of the side-slip is towards the outside of a turn, the force on the tire is towards the center of the turn. Therefore, this torque tends to turn the front wheel in the direction of the side-slip, away from the direction of the turn.

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