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Terminology & Abbreviations
Ball Weight: The downward load exerted on the tow point of the vehicle by the trailer.
GCM: (Gross Combination Mass): This is the total allowable combined mass of tow vehicle and trailer as
determined by the tow vehicle manufacturer.
Camber: Camber angle is the measure in degrees of the difference between the wheel’s vertical alignment
perpendicular to the surface. If a wheel is perfectly perpendicular to the surface, its camber would be 0
degrees. Camber is described as negative when the top of the tyre begins to tilt inward towards the chassis rail.
Toe In/out: Negative toe, or toe out, is the front of the wheel pointing away from the centreline of the vehicle.
Positive toe, or toe in, is the front of the wheel pointing towards the centreline of the vehicle.
Toe can be measured in linear units, at the front or rear of the tyre, or as an angular deflection. In the case of
MDC products, the “toe in” is measured in millimetres at the front of the tyre from the chassis rail.
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