20 Most Recent Sigma Sport BC 1009 Wired Computer Questions & Answers

http://www.sigmasport.com/en/service_center/produkt_support/bikecomputer/?flash=1&typ=bikecomputer

Find your specific one there.

Here it is: http://www.sigmasport.com/us_media/produkte/bikecomputer/topline_2009/topline_wired/bc1009/allgemein/visuals/manual_bc1009_us.pdf

Here is the user manual: http://www.sigmasport.com/us_media/produkte/bikecomputer/topline_2009/topline_wired/bc1009/allgemein/visuals/manual_bc1009_us.pdf

http://www.sigmasport.com/en/service_center/produkt_support/bikecomputer/
The entry is in diameter mm. You should actually do the roll-out of your wheel and measure it if you want real accuracy.

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.

Why not just ask the company? About Us If the modern ones no longer have that function you could look for a used computer that fills your need. I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881

Looks like that is a wired wheel sensor. Make sure the magnet lines up correctly with the wired sensor and is close enough to it. Also check for broken wires. If both those are OK and still no speed reading then the sensor is probably borked.

Have you checked the manual? Pages 24 & 25 should be able to help you. If you don't have a copy its available on the Sigma Sport site. http://www.sigmasport.com/en_media/produkte/bikecomputer/topline_2009/topline_wired/bc1609/allgemein/visuals/ba.pdf

http://www.manualslib.com/manual/395732/Sigma-Sport-Bc-300.html