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 04-20-05, 01:39 PM   #1
beekay
la moda de nada
Thread Starter
 
beekay's Avatar
 
Join Date: Apr 2005
Location: Seattle
Bikes: early 80's bianchi dog/ Klein Pulse Race
Posts: 54
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Broken Head Tube

Hello everybody,
I'm in the process of overhauling a early 70's sekine road bike that I've been commuting on for the last two years. It's a lugged steel frame. When I removed my fork to grease the headset bearings, the lower pressed race just fell out onto the ground. Upon inspection, the bottom of the headtube has split along a welded seam. Are headtubes even supposed to have seams? How unsafe has this been? Can it be fixed?

I like my bike, and I want to repair the frame if possible. If anyone could please, please help, I'd be grateful. I'm attaching some pics of the break and the headtube.

thanks,
bk
beekay is offline   Reply With Quote
Old 04-20-05, 01:56 PM   #2
Nessism
Senior Member
 
Nessism's Avatar
 
Join Date: Jun 2004
Location: Torrance, CA
Bikes: Homebuilt steel
Posts: 2,332
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Looks like the seam from the lug. In days of old, lugs were formed by stamping/folding/welding sheet metal together. Newer lugs are usually cast.

Frankly from the look of the photos, the frame is junk You could try to find someone to replace the lug or weld it up but this will cost quite a bit more than the frame is worth.

Good luck.

Ed
Nessism is offline   Reply With Quote
Old 04-20-05, 03:57 PM   #3
DocF
Older Than Dirt
 
Join Date: Aug 2004
Location: Reidsville, NC
Bikes:
Posts: 376
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Before the frame is condemned, I would take it to a frame builder if there is one near you. It may be possible to repair this. Does the frame look like it is sound otherwise?

Doc
DocF is offline   Reply With Quote
Old 04-20-05, 08:51 PM   #4
sch
Senior Member
 
Join Date: May 2003
Location: Mountain Brook. AL
Bikes:
Posts: 2,963
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Frames of this vintage would be dirt cheap if you could find one at a thrift store
or garage sale. New equivalent frame from Nashbar might be $150-250. Doubt
repair cost would be worth the expense and would necessitate a repaint. Welding
is likely to distort the tubing too much, even brazing likely would: this is where
a moderately precise part of the bike fits, the headset. Replacing the lug and perhaps the head tube would be the best approach but not worth it. Find another bike. Steve
sch is offline   Reply With Quote
Old 04-21-05, 03:08 AM   #5
beekay
la moda de nada
Thread Starter
 
beekay's Avatar
 
Join Date: Apr 2005
Location: Seattle
Bikes: early 80's bianchi dog/ Klein Pulse Race
Posts: 54
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks for the input, guess I'll be looking for a new frame.
beekay 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 09:59 AM.