Track

Track is the distance between the centres of the two wheels on the same axle, measured across the vehicle. It is simply the everyday short name for track width, and the two terms describe exactly the same dimension. Where a car has two axles it has two track figures, a front track and a rear track, each measured between the contact patches or wheel centrelines of that axle. The measurement is fundamental to how a vehicle stands on the road, and it is one of the geometry figures that engineers fix early in a design because so much of the car's behaviour flows from it.

The figure is taken between the wheels rather than the bodywork, which distinguishes it from overall width; the body always overhangs the wheels, so the track is invariably the narrower of the two. Because it depends on the wheels' position, track is affected by wheel offset and by the width of the rim and tyre fitted, and aftermarket wheels with a different offset, or bolt-on spacers, will alter it. Suspension geometry can also vary the effective track slightly through its travel as the wheels move up and down.

Track matters because it sets the lateral base over which the vehicle's weight is supported. A wider track spreads the wheels further apart, which resists the load transfer that occurs when cornering and so reduces body roll and improves grip and stability. It raises the speed at which a car will slide or, in extreme cases, lift a wheel, and it gives a more planted, confident feel through bends. This is why performance cars are typically given a generously wide track relative to their height, sometimes emphasised by flared arches, and why a tall, narrow-tracked vehicle feels more tippy.

The front and rear tracks are frequently not identical, and the difference is a deliberate tuning tool rather than an accident. By making one track slightly wider than the other, engineers adjust the front-to-rear balance of grip and so influence whether a car tends towards understeer or oversteer at the limit. A relatively wider rear track, for example, can add stability under power, while the front and rear figures are chosen together with spring rates, anti-roll bars and tyre sizes to deliver the intended handling character.

As a piece of vocabulary, track is best understood as the companion to wheelbase: the wheelbase runs lengthwise between the axles, while the track runs crosswise between the wheels of an axle, and together they define the rectangular stance on which the car sits. A long wheelbase aids straight-line stability and ride, a wide track aids cornering stability, and the ratio between them shapes the overall feel. Anyone reading a specification sheet should treat track and track width as interchangeable, and read them alongside overall width and wheelbase to picture how the vehicle is planted on the road.