PASSENGER CAR TRACK LIST USA Section LS on Tyres, Rims, Suspension and St eering of the Vehicle Standards Bulletin 14 on the National Code of Practice (NPC) for Li ght Vehicle Construction and Modifications states that the wheel track of passenger cars must not be increased by more than 25mm beyond the maximum specified by the vehicle manufacturer for the particular model. This means that the rim offset must not be changed by more than 12.5mm. The vehicle details in this Fact Sheet speci fy the maximum allowable wheel track for each vehicle including the 25mm tolerance (plus 1 mm). All Vehicles will fail for wheel track measurement if it meets or exceeds the specified measurement.
http://www.transport.tas.gov.au/__data/ ... st_USA.pdf