Calibration
1. Setting Km/H or Mile/H
A) Press the button on bottom of computer for 6 seconds to start setup.
B) Hold the button until the flickering digit is changed to the digit “2” of the C2155 to recognize either Km/H or Mile/H as desired.
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2. Setting the wheel circumference C mm
A) The default is set at 2155mm. Measure the value for your wheel.
B) A quick press of the button advances the flickering digit by 1.
C) To change the flickering digit, hold down the button until the flickering digit moves to the next digit.
D) Hold down the button until (about 6 seconds) it jumps out the setting to store the desired data and complete setup.
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3. Wheel circumference
A) Precise measurement: Roll wheel 1 revolution, measure the distance from the marked first point and the second point.
B) Measure the Wheel Radius R
Cmm = 6.2832 x R (R in mm)
Cmm = 159.60 x R (R in inches)
(1 inch = 25.4mm)
**The above mentioned instruction as calibrating the cycle computer is available for most of the Echowell’s computers, but NOT for each model. Please contact us if you have problem in re-calibration.
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TIRE SIZE REFERENCE TABLE (in mm)
Tire Size Cmm Setting Value Tire Size Cmm Setting Value
16×1.75×2
1272
27×1 1/4
2199
20×1.75×2
1590
27×1 1/4 Fifty
2174
24×1 3/8A
1948
28×1.5
2224
24×1.75×2
1907
28×1.75
2268
26×1
1973
28×1 1/2
2265
26×1.5
2026
28×1 3/8×1 5/8
2205
26×1.6
2051
700x18C
2102
26×1.75×2
2070
700x20C
2114
26×1.9
2089
700x23C
2133
26×1.95
2075
700x25C
2146
26×2.00
2114
700x28C
2149
26×2.125
2133
700x32C
2174
26×1 3/8
2105
700x35C
2205
26×1 3/8×1 1/2
2086
700cx38
2170
26×3/4
1954
700x40C
2224
26×2.1
2090
650cx20
1945
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