Calibration numbers for Avocet Cyclometers * Battery Information

Models 15/25
The calibration number equals the tire circumference in millimeters both when miles are displayed and when kilometers are displayed. Setup and calibration method.

Models 20/30/31
When miles are displayed the calibration number equals the tire circumference in inches times 2.7273. When kilometers are displayed the calibration number equals the tire circumference in millimeters times .108. Round off to the nearest whole number.Setup and calibration method.

Models 35/40/45/45tt/50
When miles are displayed the calibration number equals the tire circumference in inches; use the displayed number that comes closest to the number in the table or to your measurement. When kilometers are displayed the calibration number equals the tire circumference in millimeters.Setup and calibration method.

CALIBRATION NUMBERS
Model
15/25
20/30/31
35/40/45/45tt/50
Tire Size km/mi mi km mi km
20 x 1.75 1528 164 165 60.16 1528
24 x 1 1753 164 165 69.02 1753
600 Tubular 1759 189 190 69.25 1759
650 Tubular 1929 207 208 75.95 1929
26 x 1 1913 205 206 75.32 1913
26 x 1.25 1952 210 211 76.89 1952
26 x 1.5 1986 212 213 78.19 1986
26 x 1.9/1.95 2045 220 221 80.51 2045
26 x 2.125/2.2 2056 225 226 80.95 2056
26 x 1 3/8 2068 222 223 81.42 2068
700C Tubular 2083 224 225 82.13 2083
700 x 20 2081 221 222 81.93 2081
700 x 23 2087 224 225 82.17 2087
700 x 25 2091 224 225 82.32 2091
700 x 28 2096 225 226 82.52 2096
700 x 32 2116 227 228 83.31 2116
700 x 35 2139 230 231 84.21 2139
700 x 38 2159 232 233 85.00 2159
700 x 45 2211 237 238 87.05 2211
27 x 7/8 2077 223 224 81.77 2077
27 x 1 2105 226 227 82.91 2105
27 x 1 1/8 2123 228 229 83.58 2123
27 x 1 1/4 2142 230 231 84.33 2142

Batteries for Avocet Cyclometers

Where to get batteries
Most bicycle stores that sell Avocet Cyclometers also sell replacement batteries. You can also order batteries directly from Avocet. Use an Avocet brand battery for your Cyclometer model if possible. If your bicycle dealer doesn't carry the correct replacement battery, you can often buy an equivalent battery at an electronics store such as Radio Shack. Use the battery equivalent list below for choosing the correct battery.

Cyclometer 20 & 30:
386 silver oxide, 1.5 volt.
These were originally spec'd for 1.35 mercury which is no longer made. The 1.5 silver oxide is the closest equivalent and works well with possible shorter life than the original mercury.

Cyclometers 15, 25, 31, 35, 40, 45 and 45tt:
357 silver oxide, 1.5 volt.

For models 35 and 45 total reset is recommended before battery installation. For total reset, hold both buttons down for 30 seconds with battery out. The 357 silver oxide battery supercedes the original equipment battery for these Cyclometers. Manufacturer's cross reference numbers are listed below. Any battery on the list can be used in these Cyclometers.
Duracell D357H
Eveready 357
Maxell SR44W
National SR44W
Panasonic SR44W
Phillips 357
RayOVac 357
Renata 357
Sony SR44W
Toshiba SR44W

Cyclometer 50: 386 silver oxide 1.5 volt. Double insert procedure recommended. Put in both batteries; remove one battery for 15 seconds, then reinsert.

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