View Single Post
Old 08-31-12, 02:22 PM
Drew Eckhardt 
Senior Member
Drew Eckhardt's Avatar
Join Date: Apr 2010
Location: Sunnyvale, CA USA
Posts: 5,661
Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 258 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by BCRider View Post
It's likely that the wheel isn't correctly tensioned up then. So what is happening is that the spokes are becoming loose and "working" until they snap.

The manufacturer didn't feel like buying an expensive machine or paying some one to stress relieve the wheel before they shipped it because a few warranty claims every now and then are less expensive.

Parts of the elbows were never taken past their elastic limit in the forming operation, the high average stress reduced the number of fatigue cycles they could survive, and all the spokes in that wheel half are close to their fatigue life limit.

If the spokes were loose the failures would be in the non-drive side and the wheel would probably have trueness problems.

Optimally you would either tension and re-true the whole wheel yourself or have the shop do it. Some additional spokes will still snap over the next while since they were cyclicly fatigued by the poor tensioning but after the next few go and are replaced I would hope that it would be the end of it.
Replacing all of the remaining original drive side spokes would be prudent.

Last edited by Drew Eckhardt; 08-31-12 at 02:27 PM.
Drew Eckhardt is offline