(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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