Question about Sigma Cycling
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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.
Bicycle Parts and Accessories
Posted on Jul 10, 2009
Have you tried the Sigma web site? They have manuals there.
Click on Service Center. Then click on FAQ/Manuals, and enter your model.
Posted on Aug 30, 2009
get a tape measure and measure the out side circunfrance of the wheel. This is you number. OR put a white dob of paint on the tyre and roll it in a strainght line until the dob of paint makes a 2nd mark, (on a path way etc) measure the distance. this will be the same as the first option. Generally its required in mm.
Posted on Oct 26, 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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