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 08-27-07, 02:06 PM   #1
nowers
Junior Member
Thread Starter
 
Join Date: Oct 2004
Bikes:
Posts: 7
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Spokes loosening

I just finished re-spoking a 36 spoke Mavic rim with DT spokes. Followed Sheldon Brown's instructions, and got very uniform tension (according to the tone). Less than 100 miles later 4 spokes (3 on left and 1 on right) have unthreaded and become so loose they can be shaken1/2 inch! Never had this happen before. Any suggestions?

Dave
nowers is offline   Reply With Quote
Old 08-27-07, 02:19 PM   #2
moxfyre
cyclist/gearhead/cycli...
 
moxfyre's Avatar
 
Join Date: Oct 2004
Location: DC / Maryland suburbs
Bikes: Homebuilt tourer/commuter, modified-beyond-recognition 1990 Trek 1100, reasonably stock 2002-ish Gary Fisher Hoo Koo E Koo
Posts: 4,166
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Woahhh... that's pretty crazy.

Here are a few random ideas:
  • Did you follow SB's recommendation NOT to grease the left-side spokes, since they're under fairly low tension?
  • Did you use the right length spokes?
  • Was the initial tension level sufficient? If you've never built a wheel before, and didn't use a tensiometer, you may underestimate the appropriate tension level.
moxfyre is offline   Reply With Quote
Old 08-27-07, 06:59 PM   #3
MudPie
Senior Member
 
MudPie's Avatar
 
Join Date: May 2004
Location: Southern California
Bikes:
Posts: 1,874
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I'd vote insufficient tension. Sufficient tension is analgous to the installation torque of a bolt. The tension helps keep the nipple/spoke loosening from vibration and fluctuating loads.

I've oiled all spoke threads during wheel builds without any unwanted loosening.
MudPie is offline   Reply With Quote
Old 08-27-07, 07:43 PM   #4
moxfyre
cyclist/gearhead/cycli...
 
moxfyre's Avatar
 
Join Date: Oct 2004
Location: DC / Maryland suburbs
Bikes: Homebuilt tourer/commuter, modified-beyond-recognition 1990 Trek 1100, reasonably stock 2002-ish Gary Fisher Hoo Koo E Koo
Posts: 4,166
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by MudPie View Post
I'd vote insufficient tension. Sufficient tension is analgous to the installation torque of a bolt. The tension helps keep the nipple/spoke loosening from vibration and fluctuating loads.
+1, this is certainly the most likely cause I would imagine.

Quote:
Originally Posted by MudPie View Post
I've oiled all spoke threads during wheel builds without any unwanted loosening.
I regularly do this as well, but I have heard of others having problems.
moxfyre is offline   Reply With Quote
Old 08-27-07, 09:38 PM   #5
z415
Senior Member
 
z415's Avatar
 
Join Date: Apr 2006
Location: Gainesville/Tampa, FL
Bikes: Trek 1000, two mtbs and working on a fixie for commuting.
Posts: 2,343
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Too much grease doesn't really do much except make future truing easier and collect dirt. I throw my nipples in a tub of grease and dipped the spoke threads in the grease when I build my wheels and I've never had problems.
z415 is offline   Reply With Quote
Old 08-27-07, 10:09 PM   #6
Deanster04
Senior Member
 
Deanster04's Avatar
 
Join Date: Dec 2005
Location: Boulder, Colorado
Bikes: Cinelli Supercoursa 69, Ritchey Breakaway Cross, Mondonico Diamond Extra 05, Coors Light Greg Lemond (built by Scapin) 88, Scapin MTB, Stumpjumper 83, Specialized Stumpjumper M4, Lemond Poprad 2001
Posts: 1,366
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
No matter what you read "Tone" as a spoke tensioning "device" isn't reliable. I built wheels for years by tone and my wheels with the Park tensionometer are far superior. Even "uber builders" like Gerd Schraner will tell you the same.
Get the tool and build the wheels at the upper end of the recommended tension range and you should eliminate the loose spokes.
Deanster04 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 12:16 PM.