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Old 08-06-08, 08:44 AM   #1
Calco
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Help us with some sizes

basically im fitting this little digital thing onto my bike and my tyre size is 26 x 2.0. On the settings I can either set it to "26 inch (650a)" or "ATB 26 x 20 (650b)". Now does anybody know if the 26 x 20 refers to 26 x 2.0, just without the "." . Help appreciated
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Old 08-06-08, 09:13 AM   #2
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or a simpler question would be, what is 26 x 2.0 is millmeter measurement?
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Old 08-06-08, 09:43 AM   #3
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if you are trying to figure out your tire circumference for your computer, you should actually measure it to get the most accurate reading. Circumference will differ from tire to tire (a lot) and even for different tire pressures (a little).

line up your valve stem on the bottom of the wheel and mark it on the floor. roll the bike until the valve stem is again on the bottom and mark the floor again. measure the distance between the two marks.
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Old 08-06-08, 09:55 AM   #4
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you can check these tables if you don't want to measure yourselft
http://www.sheldonbrown.com/cyclecom...libration.html
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Old 08-06-08, 10:05 AM   #5
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Quote:
Originally Posted by _dhan_ View Post
roll the bike until the valve stem is again on the bottom and mark the floor again. measure the distance between the two marks.
I understand you should be on the bike during this. The diameter is effectively smaller with your added weight.
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Old 08-06-08, 10:37 AM   #6
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The 26 X 2.0 setting should be close enough for your application. The "." must have been left out as a function of translation in the instruction sheet.
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