## Cyclecomputer Calibration Group E

#### If the model name is highlighted, clicking on it will take you to detailed setting instructions.

CatEye Solar (miles); Paramount Series 8, 10 (miles); Sachs Huret (miles); Sigma BC 400 (miles); BC 500 (miles), BC 401 (miles); BC 500 (miles); BC 600 (miles); BC 700 (miles); BC 800 (miles); BC 1100; BC 1200+ (miles); BC 1400 (miles); BC 1600 (miles); Vetta Cycle Computer (miles)

### Circumference in millimeters/1.6093

See explanation if you are measuring using a rollout test. This calibration number is different from the one for kilometers for most of these cyclocomputers..

 700 X 44 1382 700 X 38 1355 700 X 35 1347 700 X 32 1339 700 X 28 1327 700 X 25 1308 700 X 23 1302 700 X 20 1296 27 X 1 3/8 1349 27 X 1 1/4 1343 27 X 1 1/8 1339 27 X 1 1333 26 X 2.125 1286 26 X 1.9 1276 26 X 1.5 1234 26 X 1.25 1213 26 X 1.0 (559 mm) 1189 26 x 1 (650C) 1213 Wide 700C Tubular 1316 Narrow 700C Tubular 1308 26 X 1 3/8 1288 24 1191 24 x 1 1089 20 X 1.75 (406) 927 20 X 1 1/4 (451) 1005 17 x 1 1/4 838 16 x 1 3/8 797

These computers don't adjust their internal math -- instead, you change the calibration number. A mile is 1.6093 kilometers, and the calibration number for miles is the tire circumference divided by 1.6093. You can measure the tire circumference with a rollout test, then do the division.

The manual for the Vetta Cycle computer gives the calibration number for miles as 3.9042 times the radius of the wheel. This is the same as the circumference divided by 1.6093.

## Harris Cyclery Home Page

If you would like to make a link or bookmark to this page, the URL is:
http://www.sheldonbrown.com/cyclecomp_e.html
Last Updated: by Harriet Fell