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11
variables such as inflation
pressure, rim width and
rider weight.
1. Extend a tape measure
out to 3000mm (120 inch-
es) and lock it in place.
2. With your tire inflated
to its proper pressure,
place the valve at the 6:00
position (at the bottom)
directly over the start of
the measuring tape.
3. Roll the wheel one com-
plete revolution until the
valve stem is again at the
6:00 position. Read the
tape directly under the
valve and note the distance
in millimeters. (To convert
inches to millimeters, multi-
ply inches by 25.4). Use
this number to replace the
default (default values are
2073 for wheel one, and
2134 for wheel two) when
programming your com-
puter. (See figure 12).
You may also use
the following
quick-reference chart:
Generic Tire Size Chart
This chart is for non-
Specialized tires
26 X 1.75
2140
26 X 2.0
2074
26 X 2.1
2090
650C X 20
1945
700C X 26
2124
700C X 38
2170
Programming the
circumference:
To enter the tire circumfer-
ence number, select the
Odometer (ODO) mode
and then hold down the
“MODE” button for three
seconds. The display will
now show the currently
selected tire size for wheel
option #1. (See figure 13).
If necessary scroll through
the preprogrammed tire
sizes by tapping the
“MODE” button until the
10
display will now show the
currently selected tire size
for wheel option #1. To
scroll through the prepro-
grammed tire sizes press
the “MODE” button.
When you reach the
desired tire size press the
“SET” button once to
select it and enter Easy
Calibration Mode for
wheel option #2. Follow
the same procedure to
program the wheel #2 tire
size and tap the “SET”
button to exit Easy
Calibration Mode.
ROLL OUT METHOD
The roll out method will
provide the most accurate
computer calibration and
can take into account
FIGURE 11
display shows MM and
four-digit number. This
number represents your tire
circumference in millime-
ters. Press the “MODE”
button until the flashing
digit is correct. (Note: The
“MODE” button may be
held to scroll to the correct
digit.) Press the “SET” but-
ton to select the next digit
to the right. Repeat the
process until all four digits
are entered as your tire cir-
cumference. Press the
“SET” button once to select
it and enter the circumfer-
ence for wheel option #2.
Follow the same procedure
to program the wheel #2
tire size and tap the “SET”
button to exit circumference
programming mode.
Wheel Circumfrence
Roll Forward
stem
FIGURE 12
FIGURE 13