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

Chainstay Bridge Bosses: What Are These For?

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.

Chainstay Bridge Bosses: What Are These For?

Old 05-30-12, 10:25 AM
  #1  
ColonelJLloyd 
Senior Member
Thread Starter
 
ColonelJLloyd's Avatar
 
Join Date: Dec 2009
Location: Louisville
Posts: 8,371
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 106 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Chainstay Bridge Bosses: What Are These For?

I believe I've seen this particular configuration (two bosses side by side) on the chainstay bridge before. But, why?

__________________
Bikes on Flickr
I prefer email to private messages. You can contact me at justinhughes@me.com
ColonelJLloyd is offline  
Old 05-30-12, 11:31 AM
  #2  
lee kenney
Senior Member
 
Join Date: Dec 2010
Location: B.C.
Posts: 189

Bikes: ritcheys{2** rm blizzard Geo elrick drop frame and acollection of parts bikes in waiting

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Threaded for fenders ?Is it a touring bike, extra W.B. on down tube, any on fork for low -riders ?
lee kenney is offline  
Old 05-30-12, 12:05 PM
  #3  
Metaluna
Senior Member
 
Join Date: Aug 2005
Location: New Hampshire
Posts: 1,181

Bikes: Niner RLT 9 RDO, Gunnar Sport, Soma Saga, Workswell WCBR-146

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 101 Post(s)
Liked 10 Times in 10 Posts
Wasn't there once some type of brake caliper that was mounted in that location? I'm thinking it was called a U-brake or somesuch?

I've never seen a fender that used two bosses side-by-side like that. Those look more like rack braze-ons that you'd see on the seatstays.
Metaluna is online now  
Old 05-30-12, 12:10 PM
  #4  
unterhausen
Randomhead
 
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 18,227
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 34 Times in 31 Posts
the u-brakes used something similar to a cantilever brake boss. Maybe it's for a dyno, otherwise I'm at a loss
unterhausen is offline  
Old 05-30-12, 12:31 PM
  #5  
tuz
Senior Member
 
Join Date: Dec 2006
Location: Toronto/Montréal
Posts: 1,193

Bikes: Homemade mixte, track, commuter and road, Ryffranck road

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Woah that's weird. Any other braze-ons on the frame? I see the bottle bosses, but the recessed bridge doesn't scream touring to me.
tuz is offline  
Old 05-30-12, 12:48 PM
  #6  
ColonelJLloyd 
Senior Member
Thread Starter
 
ColonelJLloyd's Avatar
 
Join Date: Dec 2009
Location: Louisville
Posts: 8,371
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 106 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
It's a sport touring frameset. Likely custom built. It features three pairs of bottle bosses and requires nutted calipers. There is an eyelet per dropout, but no other bosses for racks, etc. I'm not sure whether or not they are threaded. The frameset does not belong to me.

It doesn't make sense to me to have two fender mounts there. It could add a little more rigidity, but most fenders have a round profile, so this doesn't jibe.









__________________
Bikes on Flickr
I prefer email to private messages. You can contact me at justinhughes@me.com
ColonelJLloyd is offline  
Old 05-31-12, 09:12 AM
  #7  
tuz
Senior Member
 
Join Date: Dec 2006
Location: Toronto/Montréal
Posts: 1,193

Bikes: Homemade mixte, track, commuter and road, Ryffranck road

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I would have to assume they are for a fender. If they weren't you would need to cut the fender short to leave room for whatever else would attach to the bosses, and use a clip to fasten the fender to the bridge. Like you said two bosses don't make much sense for a rounded fender but it's probably a weird request from the customer? Custom is custom I guess...
tuz is offline  
Old 05-31-12, 09:53 AM
  #8  
Metaluna
Senior Member
 
Join Date: Aug 2005
Location: New Hampshire
Posts: 1,181

Bikes: Niner RLT 9 RDO, Gunnar Sport, Soma Saga, Workswell WCBR-146

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 101 Post(s)
Liked 10 Times in 10 Posts
Another thought: maybe it's some kind of kickstand mount?
Metaluna is online now  
Old 05-31-12, 11:28 AM
  #9  
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 41,632

Bikes: 8

Mentioned: 188 Post(s)
Tagged: 0 Thread(s)
Quoted: 6838 Post(s)
Likes: 0
Liked 217 Times in 180 Posts
Did you contact the builder and ask? everyone else has to guess..
fietsbob is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
s70rguy
Classic & Vintage
44
11-18-10 08:24 AM
DnvrFox
Fifty Plus (50+)
0
06-15-10 04:14 PM
Wildaguilar
Southern California
16
05-26-07 06:53 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

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.