Thread: Tubeless spoke tension drop
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Old 06-17-21, 11:34 AM
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terrymorse 
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Originally Posted by popeye
https://cyclingtips.com/2021/06/why-...-tension-drop/

Did you know that a tubeless tyre puts more compression force on a hooked rim than one with a tube? That increased force effectively shrinks the diameter of the rim.
Yes a tubeless tire will exert more rim force than a tire+tube at the same pressure, but for a much simpler reason than the engineer-splaining in that article, above.

Quite simply:

Air pressure always exerts a force perpendicular to its container walls. Remove the inner tube, and:
  • you slightly increase the size of the container
  • the total force from air pressure on the container rises
  • the air pressure produces more radial inwards force on the rim
  • the rim diameter shrinks
  • the spoke tension drops
That is all. NBD.

Q: Why are (some) engineers so bad at explaining things simply?
A: Because they don't adequately understand the problem.
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Last edited by terrymorse; 06-17-21 at 02:38 PM. Reason: some rewording
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