HOW TO MEASURE WHEEL FACTOR
1
2
d
xx
c
Press the Right Button to adjust the value of the rst
digit of the Wheel Factor. Once you have entered the
correct value, press the Left Button to conrm the value
and advance to the next digit. Repeat for all four digits.
Press the Left Button to advance to KM/MILE selection.
KM/MILES SELECTION: After wheel size has been input,
the Km/Miles units for distance and speed will ash.
Press the RIGHT button to choose between Kilometer
(KM) and Mile (M), press the LEFT button to conrm.
Press and hold LEFT and RIGHT buttons for
4 seconds to access wheel size input mode.
Note all information in computer will be erased.
The digits on the bottom row will ash. The
value you need to enter into the computer is
the Wheel Factor. Wheel
Factor is the circumference of the wheel in
mm. To obtain Wheel Factor:
1) Fast (and not so accurate) Method — use
chart provided.
2) Most accurate method:
a) See gure 8.
b) Inate your tires to proper pressure
c) Put a mark on the outside circumference
of your front wheel (use masking tape)
d) Put a mark on the oor.
e) Put the mark on the wheel on the mark on
the oor.
f) Rotate the wheel one full revolution until
the mark on the wheel is on the oor
again. Mark this spot on the oor.
g) Measure the distance between the marks
on the oor in mm. This is your wheel
factor (i.e. your wheel circumference).
Fig.8
distance in millimeter
per one turn
Wheel Factor C
1913
1953
2005
2010
2023
2050
2055
2068
2170
2070
2086
2096
2105
2136
2170
2145
2155
2161
2288
2326
Wheel Diameter D
26 x 1.0
26 x 1.25
26 x 1.4
26 x 1.5
26 x 1.75
26 x 1.95
26 x 2.0
26 x 2.1
26 x 2.3
700 x 18
700 x 20
700 x 23
700 x 25
700 x 28
700 x 30
27 x 1"
27 x 1 1/8"
27 x 1 1/4"
29 x 2.1
29 x 2.3