I have a bc500 bicycle computer. The dealer who sold it is out of business; I must reprogram it and I do not have the manual. The wheel size is not correct; I need the information to put in the wheel size and whatever other information that could be wrong.

Hi jayster

Here are the configurations for your bc500 wheel size

Circumference in millimeters/1.6093;circumference in millimeters
Tire Size Miles Km
700 X 44 1382 2224
700 X 38 1355 2180
700 X 35 1347 2168
700 X 32 1339 2155
700 X 28 1327 2136
700 X 25 1308 2105
700 X 23 1302 2097
700 X 20 1296 2086
27 X 1 3/8 1349 2169
27 X 1 1/4 1343 2161
27 X 1 1/8 1339 2155
27 X 1 1333 2145
26 X 2.125 1286 2070
26 X 1.9 1276 2055
26 X 1.5 1234 1985
26 X 1.25 1213 1953
26 X 1.0 (559 mm) 1189 1913
26 x 1 (650C) 1213 1952
Wide Tubular 1316 2117
Narrow Tubular 1308 2105
26 X 1 3/8 1288 2068
24 1191 1916
24 x 1 1089 1753
20 X 1.75 (406) 927 1491
20 X 1 1/4 (451) 1005 1618
17 x 1 1/4 838 1325
16 x 1 3/8 797 1282

For other configurations check this site out and plese let me know if it was helpful .
LInk Site : http://www.sheldonbrown.com/cyclecomputer-calibration.html