Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Mentioned: 35 Post(s)
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You know how folks say a chain is only as strong as the weakest link? Well it's doubly true of spokes.
On a normal spoke the weakest spot is at the elbow, which has only 80% of the strength of the rest of the spoke. That's one of the main reasons to use double butted spokes.
Your wheels have direct pull (no elbow) spokes which eliminates this weak spot. So they'll break at the new weakest spot, which is at the root of the thread. They're especially vulnerable there because of the non-crossed lacing, which reduces resiliency and concentrates the stress and deflection at this one stress riser, leading to much shorter fatigue life. The reduced spoke count doesn't help either.
Sadly, had they considered it, building with butted spokes would have restored some of that resiliency, and greatly prolonged spoke life. Most good builders use butted spokes almost exclusively because of their contribution to longer wheel life, saving plain gauge spokes for special purposes like sprint track wheels.
The wheels weren't high cost, so you need to consider your options, but if the rim is good, I'd have a local builder rebuild the wheel using butter spokes.
An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
“One accurate measurement is worth a thousand expert opinions”
- Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance
Last edited by FBinNY; 08-21-11 at 01:50 PM.