In both road and rail vehicles, the wheelbase is the horizontal distance between the centers of the front and rear wheels. ... In the case of a tri-axle truck, the wheelbase would be the distance between the steering axle and a point midway between the two rear axles.

Is wheelbase a width?

wheel base (the distance between the front and the rear wheels) has to be larger than 200 mm and the track width (the distance between two wheels on the same axle) has to be larger than 160 mm.

Is wheelbase the same as length?

A car's wheelbase is the distance between the centres of the front and rear wheels. It's therefore a smaller number than the car's full length, as measured from its front and rear end.