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moocher

What volume of air at normal atmospheric pressure is needed to fill an inner tube - a 29er MTB one for example?

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gbj_tester in reply to @moocher

For a diameter D and a cross section diameter d, the volume is π²d²D/4

In the case of an inner tube, D is approximately the bead seat diameter plus the cross section diameter, so a 50-622 tube would be

π²×50²×(622+50)/4 = 4145233mm³= 4.1 litres

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