Q: How do I use the
RPM Toe-In Gauge?
A: This is a very common question here at RPM. Although the procedure is covered
in the instructions included with the gauge, we will explain how to use the Toe-In Gauge
here along with a few descriptive photos not available in the
Important: All toe-in
measurements should be taken with the vehicle at static ride height. The gauge should only be
used on smooth, flat surfaces.
Place the gauge on its bottom edge where there are two small
feet used to stabilize the gauge in that position. The blue knob should be facing toward
you. You should be looking straight down at the top edge of the gauge. The left end of the
gauge looks like a whale's tail (these are the pointers) and the right end has a graduated
scale and a single pointer. Each line on the scale represents one degree of the total
toe-in (1/2 degree per side).
Please note that all references to "left" and "right" are your
left and right while looking at the vehicle from the front NOT the vehicle's left
and right! Keep only light tension on the spring-loaded, blue knob. Slide the gauge partially open. If you are checking an off-road
truck, install the risers just to the outside of the balancing feet, under the toe-in
gauge as shown in the upper photo. With the front of the vehicle facing you, place the gauge under the vehicle, behind
the front tires (as shown in the picture to the right). The blue knob must be facing
toward you. Choose a rib on each tire. These ribs will be
the reference ribs. Carefully place one gauge point against the inside of the reference
rib. Now slide the gauge open until the gauge-point on the other end touches the inside of the reference rib on the other tire. Tighten
the blue knob while both gauge pointers are touching the reference ribs.
Gently remove your
gauge from under the vehicle, then reset your ride height. Place the gauge in front of the tires with the blue knob
still facing you (as shown to the left). Now, only the left gauge pointer will be facing
the tire. Place this pointer against the inside edge of the same reference rib.
right side, the inside of the reference rib will be lined up with one of the lines on the
graduated scale. The outside end of the scale represents "0" degrees. Each line inwards
represents one degree of toe-in. Read the gauge at the point where the reference rib lines
up with the line on the scale. (If the reference rib does not line
up with any lines on the scale, then you have toe-out. Adjust your
turnbuckles until you get the proper amount of Toe-In or see "Checking Toe-Out"
below.) If the gauge is left locked down, the vehicle can be rapidly checked for toe-in
changes after a crash simply by placing the gauge in front of the tires and, using the
same reference ribs, checking to see if the toe has changed.
Sedans and Other Vehicles with
If you cannot get the toe-gauge to close far enough then there is a second hole in your
toe-gauge for the blue knob that allows the ends, or pointers, to come closer together.
Simply remove the knob from the standard position, close the gauge until the slot reveals
the second threaded hole, then reinstall the knob. Due to tighter tread designs or the use
of slick racing tires, it may be necessary to use the inside edge of the tires for your reference
edges. Use the small risers or some thin, equal thickness spacers (one under each front
tire) to elevate the chassis to enable you to stand the gauge up behind the tires.
Checking Toe-Out (Very rarely
If you prefer to run toe-out or the condition described above is
prevalent, then toe-out may be checked simply by starting from the front of the tires and
finishing by taking the reading from the back of the tires. The only exception being the
blue knob must now face the rear of the vehicle throughout the procedure.
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