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Rear wheel spokes breaking(4 posts)

Rear wheel spokes breakingkelsey331
Jul 16, 2003 10:00 PM

A friend of mine built a rear road wheel about a year ago. The wheel has been great but he recently broke two spokes in less then two weeks. The wheel is built up as follows:

Hub: Shimano 105
Rim: Campagnolo Omega strada hardox
Spokes: DT Aero Speed

All of the spokes are evenly (checked with a tension meter) and well tensioned. The only thing is that they did not use any type of spoke prep. or lube on the spoke threads. Is it possible that spoke wind-up could cause spokes to fail?

Both spokes broke on the non-drive side while riding on level roads. Both spokes broke at the head where the spoke enters the hub flange.
The rider is strong and rides fast but is light.

Does anyone have any ideas as to what could be causing this breakage problem?

Any help is greatly appreciated.

Thank you
Easy answercyclequip
Jul 17, 2003 3:38 AM
One of 3 causes - all resulting in excessive spoke movement at the flange elbow:
1. Spoke tension is too low overall
2. Dish is wrong - leaving non-drive side spokes tensioned too low
3. Hub flange holes are elongated (if a used hub) causing excessive movement
Most likely too little tensionKerry Irons
Jul 18, 2003 4:08 PM
Another possibility is that he just got a couple of bad spokes, but it's not likely. How did you determine that the wheel had proper tension? Spoke windup probably went away in the first 10 miles.
re: Rear wheel spokes breakingHalfWheelin
Jul 28, 2003 9:33 PM
Same with me.
Alloy nipples seem to be the culprit here.
Switching to brass.