Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 08-19-07, 03:23 PM   #1
jamiewilson3
Senior Member
Thread Starter
 
Join Date: Jan 2006
Location: Ft Mill, SC
Bikes: Parlee Z4, Storck C1.1
Posts: 1,170
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Non drive side spokes breaking

Yet another spoke thread. I did a search, but didnt find one that was exactly like mine. I am 5'10" and 140 - 150 lb. The wheels have 5000 miles on them.

I have a set of custom wheels with DT rev non drive side spokes laced 2x 28 hole with aluminum nipples. They were perfect for the first 5000 miles (1 minor true needed). 3 weeks ago, I broke a non drive side spoke at the cross point. The same thing happened on Friday.

Both breaks occured when I was standing going slowly up a hill, like when starting a ride and you have a hill, but are not warmed up yet. - so a decent amount of torque.

After the first break, I had my shop (a very good builder) replace the broken spoke and retension the whole wheel.

I am going to try and replace the broken spoke 1 more time, and see how the wheel holds up. If not, I will probably rebuild the whole non-drive side.

Does anyone have any ideas why this may be happening? Or perhaps other questions I should be asking myself about the cause?

The only thing that I can see is that there is obviously some scuffing of the spoke (black) where they cross, and this appears to be stressing them to failure.
jamiewilson3 is offline   Reply With Quote
Old 08-19-07, 03:39 PM   #2
San Rensho 
Senior Member
 
Join Date: Oct 2005
Bikes:
Posts: 5,559
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 24 Post(s)
Usually, non-drive spoke breaks indicate the tension is too low. The tension has to be really high on most wheels. I was breaking spokes and I had to crank the spokes to the point that the square on a couple of nipples just started to round off before the problem went away.
__________________
Il faut de l'audace, encore de l'audace, toujours de l'audace

1980 3Rensho-- 1975 Raleigh Sprite 3spd
1990s Raleigh M20 MTB--2007 Windsor Hour (track)
1988 Ducati 750 F1
San Rensho is offline   Reply With Quote
Old 08-20-07, 04:44 AM   #3
jamiewilson3
Senior Member
Thread Starter
 
Join Date: Jan 2006
Location: Ft Mill, SC
Bikes: Parlee Z4, Storck C1.1
Posts: 1,170
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If I jack up the tension on the NDS, then wont it pull the rim off center?
jamiewilson3 is offline   Reply With Quote
Old 08-20-07, 09:14 AM   #4
San Rensho 
Senior Member
 
Join Date: Oct 2005
Bikes:
Posts: 5,559
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 24 Post(s)
Quote:
Originally Posted by jamiewilson3 View Post
If I jack up the tension on the NDS, then wont it pull the rim off center?
You have to increase the tension on all the spokes, otherwise, yes, the dish will change.
__________________
Il faut de l'audace, encore de l'audace, toujours de l'audace

1980 3Rensho-- 1975 Raleigh Sprite 3spd
1990s Raleigh M20 MTB--2007 Windsor Hour (track)
1988 Ducati 750 F1
San Rensho is offline   Reply With Quote
Old 08-20-07, 10:16 AM   #5
Retro Grouch 
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Catrike 559 I own some others but they don't get ridden very much.
Posts: 26,910
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 212 Post(s)
Quote:
Originally Posted by jamiewilson3 View Post
The wheels have 5000 miles on them. I broke a non drive side spoke at the cross point. The same thing happened on Friday.
That's an unusual place for spokes to break. Check all of your spokes at the crossing point. My guess is that you'll be able to feel a little "notch" on each one where one spoke has worn against the other. If that's the case, I'd replace all of the non-drive side spokes.
Retro Grouch is offline   Reply With Quote
Old 08-20-07, 12:29 PM   #6
maddmaxx 
Small Member
 
maddmaxx's Avatar
 
Join Date: Nov 2003
Bikes: Leader home built hardtail, Diamondback Response
Posts: 7,140
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 1218 Post(s)
Quote:
Originally Posted by Retro Grouch View Post
That's an unusual place for spokes to break. Check all of your spokes at the crossing point. My guess is that you'll be able to feel a little "notch" on each one where one spoke has worn against the other. If that's the case, I'd replace all of the non-drive side spokes.
+1.

Tension does not appear to be a problem here. The spokes are wearing out while rubbing at the cross point.
maddmaxx is offline   Reply With Quote
Old 08-20-07, 02:22 PM   #7
smurf hunter
Senior Member
 
smurf hunter's Avatar
 
Join Date: Feb 2007
Location: Auburn, WA
Bikes: 2006 LeMond Croix de Fer, 2005 Kona Dew Deluxe
Posts: 622
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by maddmaxx View Post
+1.

Tension does not appear to be a problem here. The spokes are wearing out while rubbing at the cross point.
Could that possibly be a side effect of lacing 2x? I can't imagine enough play in the spokes for them to wear significantly enough at the crossings. If the tension was higher, perhaps the spokes would rub less?
smurf hunter is offline   Reply With Quote
Old 08-20-07, 02:45 PM   #8
jamiewilson3
Senior Member
Thread Starter
 
Join Date: Jan 2006
Location: Ft Mill, SC
Bikes: Parlee Z4, Storck C1.1
Posts: 1,170
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I talked to the builder today. He was very surprised that they were breaking there. He suggested going to a bit beefier spoke (Supercomp) and rebuilding the whole NDS. I am going to go ahead and do that. I went to my shop and picked up a new DT Rev spoke to replace the broken one. I will ride it for a few days until I can get to my spare wheels to substitute while these are gone.

While I was replacing the spoke, I checked the spoke tension (squeeze method), and they are definitely plenty tight. However, my LBS retensioned a few weeks ago when the first one broke, so that isnt to say that they were low before that.

When looking at the "Rub Damage" created at the cross point, there is some wear (anodization is gone), but I could not tell that there was any actual spoke material gone.
jamiewilson3 is offline   Reply With Quote
Old 08-20-07, 04:50 PM   #9
Retro Grouch 
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Catrike 559 I own some others but they don't get ridden very much.
Posts: 26,910
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 212 Post(s)
Quote:
Originally Posted by smurf hunter View Post
If the tension was higher, perhaps the spokes would rub less?
I'd think that increasing the tension would make them rub more. The spokes don't just cross, they interlace. Typically spokes bend around one another at the crossing point.
Retro Grouch is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 07:39 AM.