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Old 07-02-09, 02:21 PM   #1
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Setting tire size on Sigma BC906 maybe a simple thing for someone that knows.

Hi, I just purchased a Sigma BC906 bike computer and it installed very easily and the set up went good as well until I got to tire size setting.

My tires say 26x2.10 on the side and in the booklet that came with the sigma that size is not listed, what is listed is 26x2.00 which gets set at 2114 on the computer and 26x2.125 which gets set at 2133.

is a 26x2.10 tire close enough to a 26x2.125 to use that setting? do any of you fine people know what the setting should be on a 26x210 tire? I was thinking of just shaving a couple numbers off of the 26x2.125 and like setting it to 2125 or something like that, would that be close enough to be fairly accurate? or am I missing something.

any opinions and or suggestions are greatly appreciated.

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Old 07-02-09, 03:50 PM   #2
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Take the large and small numbers, the difference is 19, divided by 125. Multiply the answer by 15, and add to 2114.

Simple extrapolation.
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Old 07-02-09, 05:58 PM   #3
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Old 07-03-09, 04:00 PM   #4
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I have some 906s, and found the chart wildly off from reality. I suggest measuring a rollout of your tire and using that number.
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Old 08-15-14, 05:29 PM   #5
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Very old post, but since I just discovered this link myself, I thought that I'd share it. My Sigma BC 906 has varied quite a bit from Google Maps and it has to be Sigma's own size chart. It seems to wrong across the board. Check it out at Sheldon Brown's page. Sheldon Brown's Cyclecomputer Calibration Chart
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