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

Cantilever Post thread size?

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.

Cantilever Post thread size?

Old 02-09-20, 07:39 AM
  #1  
Tandem Tom
Senior Member
Thread Starter
 
Join Date: Dec 2011
Location: NE Ohio
Posts: 2,073

Bikes: 1992 Serotta Colorado II,Co-Motion Speedster, Giant Escape Hybrid, 1977 Schwinn Super Le Tour

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 271 Post(s)
Likes: 0
Liked 18 Times in 15 Posts
Cantilever Post thread size?

I want to chase the threads on the bosses. Would anyone know the size?
Thanks!
Tandem Tom is offline  
Old 02-09-20, 08:12 AM
  #2  
unterhausen
Randomhead
 
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 19,101
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 164 Times in 132 Posts
it's a 6mmx1 Which is the standard 6mm coarse thread.
unterhausen is offline  
Old 02-09-20, 08:31 AM
  #3  
Tandem Tom
Senior Member
Thread Starter
 
Join Date: Dec 2011
Location: NE Ohio
Posts: 2,073

Bikes: 1992 Serotta Colorado II,Co-Motion Speedster, Giant Escape Hybrid, 1977 Schwinn Super Le Tour

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 271 Post(s)
Likes: 0
Liked 18 Times in 15 Posts
Thanks! BTW does it need to be a flat bottom tap or will a regular one work?
Tandem Tom is offline  
Old 02-09-20, 08:33 AM
  #4  
Tandem Tom
Senior Member
Thread Starter
 
Join Date: Dec 2011
Location: NE Ohio
Posts: 2,073

Bikes: 1992 Serotta Colorado II,Co-Motion Speedster, Giant Escape Hybrid, 1977 Schwinn Super Le Tour

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 271 Post(s)
Likes: 0
Liked 18 Times in 15 Posts
Woops I think I may have described the situation incorrectly. The threads I am referring to are the one on the boss that is brazed to the stay. Not the one that the brake is bolted to.
Tandem Tom is offline  
Old 02-09-20, 12:13 PM
  #5  
Andrew R Stewart 
Senior Member
 
Andrew R Stewart's Avatar
 
Join Date: Feb 2012
Location: Rochester, NY
Posts: 12,554

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: 2046 Post(s)
Liked 204 Times in 163 Posts
Bosses with a removeable post (often found on Al or Carbon frames, less so on steel ones) have been made with a few different threadings. Generally larger in diameter and with a coarser pitch then the M6 threads that run inside the pivot portion of a canti mount. As to the need for a bottoming tap- I would think it is obvious as to is the hole a through one or with a bottom (as in blind).

Didn't the bases come with their posts? If so then can't you measure the post? Andy
__________________
AndrewRStewart
Andrew R Stewart is offline  
Old 02-09-20, 01:06 PM
  #6  
unterhausen
Randomhead
 
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 19,101
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 164 Times in 132 Posts
I I can't imagine a taper (starting) tap will work too well, you'll need a bottoming tap. Or maybe a plug tap will work. In any event, you probably are not going to get it locally unless you have an industrial supply.

It says M10 x 1.5 on paragon's site. There have been other sizes, but I can't imagine you having access to unbrazed bosses for those other sizes. M10 x 1.5 is the standard 10mm coarse thread.

Last edited by unterhausen; 02-09-20 at 01:13 PM.
unterhausen is offline  
Old 02-09-20, 01:55 PM
  #7  
Tandem Tom
Senior Member
Thread Starter
 
Join Date: Dec 2011
Location: NE Ohio
Posts: 2,073

Bikes: 1992 Serotta Colorado II,Co-Motion Speedster, Giant Escape Hybrid, 1977 Schwinn Super Le Tour

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 271 Post(s)
Likes: 0
Liked 18 Times in 15 Posts
Andy, they did come with posts but after we brazed them on the fork blades and seatstays they seem a bit "sticky". So I thought I'd chase the threads and clean them up.
Tandem Tom is offline  
Old 02-09-20, 02:00 PM
  #8  
unterhausen
Randomhead
 
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 19,101
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 164 Times in 132 Posts
if they thread in, being sticky is good. I thought they came with loctite on them. I would just put some grease on the threads
unterhausen is offline  
Old 02-09-20, 02:14 PM
  #9  
Tandem Tom
Senior Member
Thread Starter
 
Join Date: Dec 2011
Location: NE Ohio
Posts: 2,073

Bikes: 1992 Serotta Colorado II,Co-Motion Speedster, Giant Escape Hybrid, 1977 Schwinn Super Le Tour

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 271 Post(s)
Likes: 0
Liked 18 Times in 15 Posts
Unterhausen, thanks!! I didn't think to look at Paragon's site and that's where I got them! I checked McMaster Carr and they have the tap for $10. Works out as I need a few other things from them and their fulfillment center is only 30 minutes away.
Tandem Tom 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 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.