TIRE SIZE MODE
Description: This mode allows the user to adjust the
tire size setting on the vehicle. This will ensure proper
speedometer reading, odometer function, and automatic
transmission shift points.
Note:
• In order to program the proper tire size, a
measurement of the front tire will need to be taken
on the vehicle under normal load and air pressure
rounded down to the nearest quarter inch (1/4”).
DO NOT use the manufacturers listed tire size.
• Because a correct speedometer is important, if
possible we recommend using a handheld GPS
device (phone apps work well) to conrm the
speed once set. Using the cruise control, lock the
speed to 60-70mph on the highway where safe
and legal, have a passenger read the GPS at this
speed. A correctly congured vehicle should be
between 1–2 mph high or low at this speed. Feel
free to make small adjustments using the ProCal
as needed. A fast speedometer needs a smaller
programmed tire value. The number you end up
programming is unimportant to the measured tire
size so long as the GPS speed matches.
• There are two tire size ranges, the rst is for tires
that are 24.00 inches to 38.75 inches (see Quick
Reference Guide), and the second is for tires that
are 39.00 inches to 53.75 inches in diameter.
Begin by setting the rst three switches to select
the proper mode.
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