wheel tread

Wheel Tread

 

the distance between the longitudinal axes of the impressions (on the road surface) of the right and left wheels of a single axle of a motor vehicle; with the double rear wheels of trucks and buses, the distance between the middles of the impressions of the right and left double wheels. Since in a majority of instances the tread of the axles differs for motor vehicles with front and rear (multiple) axles, the various treads are designated separately.

wheel tread

The distance between the center of the port and the star-board undercarriage contact points.