The manual explains how to measure your wheel exactly and set it into the computer...
http://www.sigmasport.com/en/service_center/produkt_support/bikecomputer/?flash=1&typ=bikecomputer
Page 28 and 30.
4. Wheel size BIKE 1
• Press MODE to change to BIKE 1.
• Press SET briefly and the first digit flashes.
• Set the value by pressing RESET, change to the next digit by pressing MODE.
• Bike 1 is always the bike with the handlebar holder WS 1
(Consult chart or figure yourself by measuring from the top of the tire to the ground in inches.) Measurement X 25.4 x 3.14 / 1.61 = ws ( / is divided by)
http://www.thisoldtractor.com/gtbender/mg_manuals/sigma_sport_bc1200.pdf
There's a chart in the link below. I believe Columns E and F apply.
http://www.sheldonbrown.com/cyclecomputer-calibration.html#ccc
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