Thread: Physics: loose spokes as weather warms up?
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Old 04-05-15 | 07:44 AM
  #24  
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RollCNY
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Originally Posted by wphamilton
I thought the same thing. Did you check my rough calculation, of < 1/7th turn looser if it's 70°F colder?
Your math is wrong. TPI of 56 means 0.018" per revolution. When I run the worst case #'s I can imagine (70°F, alum rim & ferritic stainless spoke for expansion ∆ of 6.8*10-6 in/in°F, 11.6" radius), I get 0.000079" difference, or 1/226th of a turn. And I don't think spokes are ferritic stainless.

Edit: i just stuck a magnet to a bundle of spokes, so they very well may be ferritic stainless.
Last edited by RollCNY; 04-05-15 at 07:47 AM.
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