The Rolling Method

Traditionally it has been necessary to perform a "run-out" of the wheel clamp after fitting it on the wheel, to avoid angle errors derived from a skew attachment or a skew rim. This involves jacking up the axle and spinning the wheels while adjusting the wheel clamp spindles to eliminate spindle/bearing misalignment.

With the rolling method, quite simply you skip the manual run-out completely. Instead a measurement is done just as the vehicle stands on the floor followed by rolling the vehicle so that the wheels turn half a turn. The TruckCam system by this method is able to measure before and after rolling and can correct for errors from the wheel clamp. Toe as well as camber values will be displayed automatically after rolling, and the computer is ready to monitor any adjustments if necessary.

This method can be used to measure a vehicle axle by axle, or to measure two axles simultaneously by rolling the vehicle once.

Check out the rolling method in these video clips:
Measuring a truck
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Measuring a trailer
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