Filter
Top Products
gram 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 vari-
ables 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 posi-
tion (at the bottom) directly
over the start of the meas-
uring 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
9
4. Wheel Circumference
Selection:
To set the circumference for
the type of tires you are
using, you can use
Specialized’s “Easy
Calibration Mode” or
measure your actual tire
circumference by the roll-
out method. Two different
tire diameters may be
entered by using the com-
puter’s “Second Wheel
Option.”
Easy Calibration Mode:
Your Turbo® Comp has
been preprogrammed with
the following 14
Specialized tire sizes:
26 X 1.0
26 X 2.2
26 X 1.25
650c X 20
26 X 1.5
700c X 20
26 X 1.9
700c X 23
26 X 1.95
700c X 26
26 X 2.0
700c X 32
26 X 2.1
700c X 38
When using Easy
Calibration Mode, the
Turbo® Comp will display
the tire size on its LCD dis-
play screen. (See figure
11) The Easy Calibration
Mode is accessed by enter-
ing the Odometer (ODO)
mode and holding down
the “MODE” button for
three seconds. The 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 pro-
8
FIGURE 11
Wheel Circumfrence
Roll Forward
stem
FIGURE 12