Question about Sigma Bc 906 Computer
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Posted on Jan 02, 2017
you can measure your wheel by placing your bike on a flat surface with
the valve stem on the wheel in the bottom most position or 6 o clock
position. mark the floor where the valve stem is. now roll the bike
forward so that the wheels gets one full revolution and the valve stem
comes back to the 6 o clock position and mark the floor at the valve
stem. now get a tape measure and measure the distance between your two
marks. Convert this measurement to usually centimeters. that will be
the number that put into your computer.
the manual can be downloaded here
Bicycle Parts and Accessories
Posted on Jul 10, 2009
The manual for sigma computers can be found at www.sigmasport.com.
The manual for your sigma computer can be found at:
Posted on Jul 17, 2009
The number you are entering should be the circumference of the tire, measured in millimeters. 1254 looks pretty small for your wheel. You can get the circumference by rolling the tire one revolution and measuring the distance with a tape measure. I usually lay out the tape, start with the tire valve at zero, roll one revolution, and read the number. Of course this number could be off by a few percent as the tire isn't exactly the same size due to rider weight, air pressure, tire wear, and temperature. If the error is large you need to do some riding on a known distance, like a running track, and then tweak the number up or down slightly until you are happy.
Posted on Apr 20, 2010
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