Have some new-ish wheels with about 1,000 mi on them. Carbon tubular, 50mm. On Friday, I popped a spoke nipple, NDS. LBS fixed it up that night. I rode about 50-miles each day, Sat, Sun & Mon (total of 150-miles) and popped another nipple head about 5-miles from home.
Near as I can figure, it must be
- Pressure from below the nipple pushing up on the head, or
- Twisting pressure that "unscrews" the head, or
I can't figure out what would be doing this. Anybody ever seen this or have any ideas?
(Cross-posted in Mechanics forum, but put here for more eyeballs.)