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

Headset and Bottom Bracket Suggestions

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.

Headset and Bottom Bracket Suggestions

Old 12-20-16, 07:23 AM
  #1  
Banchad
Senior Member
Thread Starter
 
Join Date: Feb 2015
Posts: 152

Bikes: Planet X Pro Carbon, Dolan FXE, Fuji Transonic

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Headset and Bottom Bracket Suggestions

Hello all,
I'm making my own frame at home out of carbon fibre but I've run into a road block. I am unsure as to how to make a headtube or a bottom bracket shell.

The main problem I am having is the headset bearing cups. I am currently experimenting at moulding these out of carbon to be able to be bonded into another CF tube that I am going to make but I don't know whether this is a good route to follow.

With the bottom bracket I am undecided as to whether to buy and use an existing BB shell or attempt to make a CF tube for a pressfit bracket. I want to use Shimano Ultegra 6800 cranks and I believe the best route to take would be to bond an existing shell in but I am not sure.

Any advice would be greatly appreciated!
Banchad is offline  
Old 12-20-16, 08:34 AM
  #2  
Andrew R Stewart 
Senior Member
 
Andrew R Stewart's Avatar
 
Join Date: Feb 2012
Location: Rochester, NY
Posts: 14,936

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: 2927 Post(s)
Liked 1,206 Times in 846 Posts
I would strongly suggest that you retain metal contact points for the components. So a SS Bb sleeve bonded into the carbon and a SS head tube also bonded in. This way you can machine the needed specs prior to bonding and know that all will be good after. I also suggest that you consider staying away from a press fit BB. They are well known for fit up/noise issues. Threading has stood the test of time for a good reason.


If you can search the archives for others' working with carbon for more specific techniques. Also go over to VELOCIPEDE SALON and do the same. there are some very experienced posters there who have gone through exactly what you're beginning. Some companies make the sleeves/headtubes ready for bonding. IIRC paragon is one. Andy.
Andrew R Stewart is offline  
Old 12-21-16, 03:25 AM
  #3  
reddog3
Senior Member
 
Join Date: Nov 2010
Location: River City, OR
Posts: 672
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
If I were tempted to build using CF I'd research everything I could find regarding Crumpton. Over on the now defunct "Framebuilder's Collective" Nick Crumpton un-selfishly shared some of his techniques. The info is still there in the "Resources" section in PDF form. Scroll to the bottom of the page. Sorry for not providing a link.
reddog3 is offline  
Old 12-21-16, 04:36 AM
  #4  
CliffordK
Senior Member
 
CliffordK's Avatar
 
Join Date: Nov 2014
Location: Eugene, Oregon, USA
Posts: 25,296
Mentioned: 204 Post(s)
Tagged: 0 Thread(s)
Quoted: 13658 Post(s)
Liked 1,924 Times in 1,458 Posts
One should be able to machine carbon fiber somewhat, but I agree, there would be benefits of using say a Titanium headtube machined for an internal headset bearing, and the same for the bottom bracket.

You could potentially design a truss between the two ends of the head tube or bottom bracket shell. Or, potentially judicious "drillium" That could help improve the bonding of the carbon fiber to the shell.
CliffordK is offline  
Old 04-09-17, 08:43 PM
  #5  
Shwnmtthws
Newbie
 
Join Date: Mar 2017
Posts: 2
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Banchad, how is the progress? what did you choose with the head set? what epoxies and fibers did you start with?
Shwnmtthws is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
FlashBazbo
Road Cycling
96
01-02-17 11:06 AM
TKJava
Bicycle Mechanics
7
08-21-16 02:11 PM
azza_333
Bicycle Mechanics
5
07-16-15 08:49 PM
RaleighSport
Framebuilders
10
06-18-11 02:16 AM
Campag4life
Framebuilders
6
03-23-11 02:40 PM

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.