X = 2131
X =
5 x 2110
4.95
(new wheel size)
(actual miles) x (current wheel size)
(current miles)
=
X =
10550
4.95
MEASURE WHEEL SIZE:
WHEEL SENSOR TEST:
Test for correct sensor/magnet placement before permanently mounting.
1. Set the vehicle on a stand so that the front (left) wheel spins easily.
2. Plug the wheel sensor cable into the computer.
3. Install the magnetic bolt.
4. Hold the sensor in place on the caliper mount by hand. While someone
watches the computer, roll the wheel. If the computer does not register,
move the magnet or sensor and try again. There should be 1/2” or less
gap between the sensor and magnet.
Do not mount so that the magnet passes the middle section of the
sensor. Either the sensor will not register at all; or the sensor will
register twice, causing a “double trigger” effect (computer displays
twice the true speed.)
If a double-trigger is unavoidable, divide the wheel
size setting in the computer by 2 to correct the problem.
Magnet Rotation Path
Knowing your exact wheel size it critical for the wheel sensor to calculate
correct speed and distance data.
When comparing calibration to GPS data, use a long straight section of road
with no tight corners or small vertical movements.
On a flat surface, mark the tire sidewall and the ground with a marking pen. Roll the
wheel until the mark on the tire completes one revolution and is back on the ground. Mark
the ground at this location. Measure the distance between the marks on the ground in
millimeters (multiply inches by 25.4 to convert to mm). Use this number for your wheel size.
For accuracy, the rider’s weight should be on the bike when making the measurement.
Method 2: Rolling
Find the circumference of front wheel by measuring its diameter in millimeters.
Multiply the Wheel Diameter by 3.14. The result is your wheel size.
Method 1: Ruler
Enter the number you calculate from one of
the above formulas into setup mode.
Method 3: Distance Measurement
This is the most accurate method.
1. Set the wheel size to 2110mm (motorcycle) or 1675 (ATV).
2. Find a length of road where the distance is known.
3. Ride the distance, noting how far the computer reads (i.e. the road
is known to be 5 miles and the computer shows 4.95 miles.)
4. Use the numbers to solve for X in the following equation:
Wheel Size =
Wheel Diameter(mm)
x3.14
Diameter
x3.14
Wheel Size:
Motorcycle:
ATV:
2110 mm
1675 mm
Generic/Average Sizes:
WHEEL SENSORS
SETUP