THE WA1890 TRAILER TANDEM TRACKER SET FOR ALUMINUM WHEELS,  UP TO 28", IS USED TO AID IN MEASURING THE TRACKING OF THE TANDEM AXLES IN RELATIONSHIP TO THE KINGPIN EXTENSION AND THE FRONT AND REAR AXLES ON THE TANDEM.  THE TRACKERS ESTABLISH THE MEASURING POINT FROM THE CENTER OF THE WHEELS TO THE KINGPIN EXTENSION AND BETWEEN THE CENTERS OF THE FRONT AND REAR AXLES ON THE TANDEMS.  THE TRACKERS FIT ON THE OUTSIDE OF THE WHEELS SO THEY WILL NOT DAMAGE ALUMINUM WHEELS.

THERE IS NO NEED TO REMOVE THE HUB COVERS.
ELIMINATES THE MESS ENTAILED IN REPACKING THE HUBS.
PROVIDES ACCURATE MEASURING POINTS.
ONE TECHNICIAN CAN MAKE THE MEASUREMENTS ALONE.
CORRECT TRACKING SAVES TIRE WEAR.

THE TANDEM TRACKERS MAKE IT EASY TO PERFORM THIS IMPORTANT PREVENTATIVE MAINTENANCE PROCEDURE EASILY AND QUICKLY.  SUGGEST TWO SETS OF THE WA1890 TO SAVE EVEN MORE TIME WHEN CHECKING THE TRACKING OF BOTH TANDEMS.  THEY ALSO CAN BE USED ON STEEL WHEELS.