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 05-11-08, 11:07 PM   #1
zenmster
Newbie
Thread Starter
 
Join Date: May 2008
Bikes:
Posts: 2
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Stripped water bottle thread NOT the head

how do you fix that? It's the thread that was forced into the bike by a bike mechanic in SA. I only noticed this now while trying to take it out. What do you do? Right now i've got string wrapped around the cage and the frame to keep it together. Is this permanently damaged? The screw thread is smooth...completely so. I tried a new screw but it doesn't fit easily and I didn't want to force it again.

Suggestions?
zenmster is offline   Reply With Quote
Old 05-11-08, 11:15 PM   #2
Ziemas
Senior Member
 
Ziemas's Avatar
 
Join Date: Nov 2004
Location: Riga, Latvia
Bikes:
Posts: 10,082
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Perhaps a Riv-Nut would work. Or a really small heli-coil.

http://www.emhart.com/products/helicoil.asp

http://www.aimfasteners.com/about_rivnut.html
Ziemas is offline   Reply With Quote
Old 05-11-08, 11:29 PM   #3
Torchy McFlux
Senior Member
 
Torchy McFlux's Avatar
 
Join Date: Sep 2007
Location: Vancouver
Bikes: NOYB
Posts: 1,438
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Are the threads completely gone? Because it's just a bottle bolt. If the boss is just cross-threaded, run a tap through it and remember not to pull too hard on the wrench when tightening down the bolt afterwards.
Torchy McFlux is offline   Reply With Quote
Old 05-12-08, 12:41 AM   #4
zenmster
Newbie
Thread Starter
 
Join Date: May 2008
Bikes:
Posts: 2
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Tap?

what's a tap? Sorry - I'm pretty ignorant here.
zenmster is offline   Reply With Quote
Old 05-12-08, 01:29 AM   #5
kmcrawford111
50/50 Road/eBike Commuter
 
kmcrawford111's Avatar
 
Join Date: May 2007
Location: Valparaiso, IN
Bikes: Specialized Roubaix, Specialized Sirrus, Brompton
Posts: 764
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
A tap is a tool for cutting female threads (the threads inside the hole). If you go to a decent tool shop, you don't have to buy a whole set of taps, or even more to the point, a whole set of both taps and dies (dies are tools for cutting male threads) and end up with an empty wallet and a bunch of tools you'll never use. I just bought a die from Bike Tools Etc. and they were excellent. This is what is needed, along with a tap wrench/handle:

http://www.biketoolsetc.com/index.cg...em_id=WE-315D4

Sears Hardware also might carry it by itself.

Last edited by kmcrawford111; 05-12-08 at 01:46 AM.
kmcrawford111 is offline   Reply With Quote
Old 05-12-08, 02:03 AM   #6
daoswald
Senior Member
 
Join Date: Apr 2008
Location: Los Angeles
Bikes: 2008 Cannondale Synapse Sport 5
Posts: 587
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I realize this is a BIKE forum, and not a sailboat forum, but in the sailing world when we strip something like that, we fill with epoxy, re-drill, and then re-tap. This includes for aluminum masts, for example.

Perhaps it's a good thing I'm not a bike mechanic.
daoswald is offline   Reply With Quote
Old 05-12-08, 02:13 AM   #7
Soil_Sampler
A little North of Hell
 
Join Date: Mar 2006
Bikes:
Posts: 4,821
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 25 Post(s)
Quote:
Originally Posted by Ziemas View Post
Perhaps a Riv-Nut would work.
+1

riv-nut or nutsert.
Soil_Sampler is offline   Reply With Quote
Old 05-12-08, 05:55 PM   #8
rmfnla
Senior Member
 
rmfnla's Avatar
 
Join Date: May 2005
Location: La La Land (We love it!)
Bikes: Gilmour road, Curtlo road; both steel (of course)
Posts: 6,256
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 226 Post(s)
Drill the hole through both sides of the tube and use a 2" bolt and a nut

Kidding; a Riv-nut is the easiest & best-looking repair.
__________________
Today, I believe my jurisdiction ends here...
rmfnla is offline   Reply With Quote
Old 05-13-08, 10:30 AM   #9
DMF 
Elitist Troglodyte
 
DMF's Avatar
 
Join Date: Jun 2006
Location: Dallas
Bikes: 03 Raleigh Professional (steel)
Posts: 6,924
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by daoswald View Post
I realize this is a BIKE forum, and not a sailboat forum, but in the sailing world when we strip something like that, we fill with epoxy, re-drill, and then re-tap. This includes for aluminum masts, for example.

Perhaps it's a good thing I'm not a bike mechanic.
That would work on a bike, too, but since the OP doesn't know what a tap is, he's not going to fix it any way. Needs to go to a shop.
__________________
Stupidity got us into this mess - why can't it get us out?

- Will Rogers
DMF is offline   Reply With Quote
Old 05-14-08, 09:38 AM   #10
ultraman6970
Senior Member
 
Join Date: Dec 2005
Bikes:
Posts: 7,860
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
He doesnt need a tap in my opinion... well he can make one using an allen bolt?? Just go to lowes and get a milimetric m5 allen bolt and put that thing in there. The other solution could be get an allen in inches almost the same size of the one that broke, I believe the water botle size is M4? The inches one will be a little bit bigger so it should work fine. I know is not a super fancy fix but it will work with the tools he might have at home.

Thanks
ultraman6970 is offline   Reply With Quote
Old 05-14-08, 12:15 PM   #11
CaptainCool
``````````````
 
CaptainCool's Avatar
 
Join Date: Feb 2007
Location: san jose
Bikes:
Posts: 763
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by ultraman6970 View Post
He doesnt need a tap in my opinion... well he can make one using an allen bolt?? Just go to lowes and get a milimetric m5 allen bolt and put that thing in there. The other solution could be get an allen in inches almost the same size of the one that broke, I believe the water botle size is M4? The inches one will be a little bit bigger so it should work fine. I know is not a super fancy fix but it will work with the tools he might have at home.

Thanks
No, that won't work. The shaft of the bolt will be too large. Anyway, a tap is made of hardened steel, and designed to cut where a normal bolt would try to smash.
CaptainCool is offline   Reply With Quote
Old 05-14-08, 06:20 PM   #12
N8N
Member
 
Join Date: Apr 2008
Bikes:
Posts: 35
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I guess my approach would vary depending on how the original "braze-on" is constructed. If it's a real braze on I would try a tap. If it's, say, a Cannondale which uses rivnuts from the factory I would probably just drill it out and insert a new rivnut. You probably would have to remove the bottom bracket to get the broken pieces out though if that bothers you.

nate
N8N is offline   Reply With Quote
Old 05-14-08, 06:22 PM   #13
ultraman6970
Senior Member
 
Join Date: Dec 2005
Bikes:
Posts: 7,860
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Actually I did something similar in my commuter, to hold the BB cable guide. Just used a drill then a M5 fixed to look as a tap, done. The thread was perfect.

ultraman6970 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 02:35 PM.