Go Back  Bike Forums > Bike Forums > Framebuilders
Reload this Page >

Removing Top Tube

Notices
Framebuilders Thinking about a custom frame? Lugged vs Fillet Brazed. Different Frame materials? Newvex or Pacenti Lugs? why get a custom Road, Mountain, or Track Frame? Got a question about framebuilding? Lets discuss framebuilding at it's finest.

Removing Top Tube

Old 01-03-21, 11:23 AM
  #1  
TiHabanero
Senior Member
Thread Starter
 
Join Date: Nov 2012
Posts: 3,312
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 1169 Post(s)
Liked 468 Times in 249 Posts
Removing Top Tube

Working on replacing the top tube on a bike, and am trying to salvage the tube to use on another project. In the past I have not had to preserve the tube as it was damaged anyway, so I cut the tube and was able to pull it out as the joint came to temp. This time I need to keep the tube in tact. Any guidance on this? Can it even be done?
TiHabanero is offline  
Old 01-03-21, 12:39 PM
  #2  
Cynikal
Team Beer
 
Cynikal's Avatar
 
Join Date: Apr 2004
Location: Sacramento CA
Posts: 6,159

Bikes: Too Many

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 64 Post(s)
Liked 54 Times in 41 Posts
Assuming that the frame is lugged, I doubt you could without cutting the rest of the frame up.
Cynikal is offline  
Old 01-03-21, 01:46 PM
  #3  
TiHabanero
Senior Member
Thread Starter
 
Join Date: Nov 2012
Posts: 3,312
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 1169 Post(s)
Liked 468 Times in 249 Posts
Cynikal, yes, the frame is lugged. Forgot that little detail!
TiHabanero is offline  
Old 01-03-21, 02:50 PM
  #4  
unterhausen
Randomhead
 
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 20,869
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 875 Times in 653 Posts
are you salvaging anything else?
unterhausen is offline  
Old 01-03-21, 04:12 PM
  #5  
Andrew R Stewart 
Senior Member
 
Andrew R Stewart's Avatar
 
Join Date: Feb 2012
Location: Rochester, NY
Posts: 14,328

Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Raleigh Pro, Trek Cycle Cross, Mongoose tomac ATB, GT Bravado ATB, JCP Folder

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2692 Post(s)
Liked 866 Times in 632 Posts
Consider cutting through the HT just below the upper lug. Then heat and pull the TT from the ST lug.

This is not what I would want to do though as pulling a tube from a lug is ripe for a few problems that make the repairs get more involved or less nice looking. (metal likes to do weird things when it gets to filler melting temps. Lug tips break off, tubes tear, the heat level is hard to maintain evenly so usually there's a way too hot area and almost but not quite to temp area).

For the cost of a new TT I would suggest not saving the old one. Andy
__________________
AndrewRStewart
Andrew R Stewart is offline  
Old 01-03-21, 04:49 PM
  #6  
unterhausen
Randomhead
 
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 20,869
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 875 Times in 653 Posts
steel gets really weak at temperatures well below the melting point of fillers. I was a bit surprised at that, The conclusion I draw from this is you don't want to put much force on a tube when removing it from a lug.
When I removed the bb shell from a frame recently, I was pretty careful to not push on the tubing very hard. And I cut everything up except the tubing I was saving. I think you need a lot of heat to do this, as in multiple torches or firebricks and a gas burner.

There used to be some pages on a repair done by Yellow Jersey in Madison Wi. I would go look for that.
unterhausen is offline  
Old 01-03-21, 08:03 PM
  #7  
JohnDThompson 
Old fart
 
JohnDThompson's Avatar
 
Join Date: Nov 2004
Location: Appleton WI
Posts: 22,194

Bikes: Several, mostly not name brands.

Mentioned: 130 Post(s)
Tagged: 0 Thread(s)
Quoted: 2430 Post(s)
Liked 938 Times in 602 Posts
…and make sure the joints are not pinned before trying to pull them apart!
JohnDThompson is offline  

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


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.