Inautomobiles (and otherwheeled vehicles which have two wheels on anaxle), theaxle track is the distance between the hubflanges on an axle.[1]Wheel track,track width or simplytrack refers to the distance between the centerline of two wheels on the same axle. In the case of an axle with dual wheels, the centerline of the dual wheel assembly is used for the wheel track specification. Axle and wheel track are commonly measured in millimetres or inches.[2][3]
Despite their distinct definitions,axle track, (not to be frequently and incorrectly used interchangeably aswheel track andtrack width), normally refers to the distance between the centerline of the wheels. For a vehicle with two axles, the term can be expressed asfront track andrear track. For a vehicle with more than two axles, the axles are normally numbered for reference.[4]
In vehicles withoffset wheels, wheel track is distinct from axle track because the centreline of the wheel is not flush with the hub flange. If wheels of a different offset are fitted, the wheel track changes but the axle track does not.[5]
In the railroad industry, the term "axle track" is not used; the same concept is called "flange gauge" or "wheel gauge". It is measured on awheelset of arailroad car ortram from onewheel flange reference line to the reference line of the other wheel. It must be compatible with the "track gauge" – the distance between the facing edges of the running rails – of the network it runs on.[6] The maximum and minimum limits to the differences between the two gauges are usually 111⁄32" and3⁄8" (9–35 mm).
Model railway elements such astrack,rolling stock andlocomotives are categorised by their wheel or track gauge. AnHO scale orOO gauge model locomotive, for example, has a wheel gauge of 16.5mm.[7]
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