FIGURE 11
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
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).
Roll Forward
stem
Wheel Circumfrence
FIGURE 12
You may also use the following
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
FIGURE 13
display shows MM and
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