Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

Cantilever bosses with backwards spring notches?

Notices
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.

Cantilever bosses with backwards spring notches?

Old 05-06-07, 02:16 PM
  #1  
Snordalisk
Senior Member
Thread Starter
 
Snordalisk's Avatar
 
Join Date: Nov 2003
Location: Worcester, MA
Posts: 129

Bikes: 1977 Raleigh Professional, 1997 Milano 3v, 2004 Surly Karate Monkey, 2007 Surly Crosscheck, 1984 Hutch Pro Racer

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Cantilever bosses with backwards spring notches?

I've just started work on a Shogun Praire Breaker II mountain frame of unknown vintage, it's got really laid back geometry and Tange MTB tubing, if that helps determine anything.

It has what at first glance seem like roller cam bosses with the spring notches outboard, but they're located below the rim like cantilever bosses. No brakes came on the frame, and it's unknown whether it was a warranty replacement or not, so it could even be defective.

Anyone have any ideas as to what I can use for a rear brake on this? I tried some current stock cantilevers but the spring really (really) didn't take kindly to being bent that far around. I'm willing to do some crazy modifications if necessary.
Snordalisk is offline  
Old 05-06-07, 02:36 PM
  #2  
Snordalisk
Senior Member
Thread Starter
 
Snordalisk's Avatar
 
Join Date: Nov 2003
Location: Worcester, MA
Posts: 129

Bikes: 1977 Raleigh Professional, 1997 Milano 3v, 2004 Surly Karate Monkey, 2007 Surly Crosscheck, 1984 Hutch Pro Racer

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Forgot to mention, the bosses are mounted on the seat stays, not under the chain stays.
Snordalisk is offline  
Old 05-06-07, 02:38 PM
  #3  
well biked 
biked well
 
well biked's Avatar
 
Join Date: Jul 2005
Posts: 7,402
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 112 Post(s)
Liked 87 Times in 53 Posts
I had a Shogun Prairie Breaker, mine was mid '80's, with a lugged frame and a "double plate" fork crown. I really love the fork, I've still got it in fact. Mine has standard brake bosses, they're compatible with canti's or even modern linear pulls. The roller cam brakes you mention were a bit of a flash in the pan, they came and went fairly quickly, so it's probably that your frame happened to be produced during the "roller cam" period. Ebay may be your best bet, you could probably find some roller cam brakes there with some patience. I've heard they're good brakes, but I've never used them myself..........I do have an old Trek mtb with under-the-chainstay U-brakes, though. Braking performance good, putting them beneath the chainstay on an off-road bicycle: dumb idea in my opinion. I realize yours are seatstay-mounted, though-

Last edited by well biked; 05-06-07 at 02:47 PM.
well biked is offline  
Old 05-06-07, 06:13 PM
  #4  
Snordalisk
Senior Member
Thread Starter
 
Snordalisk's Avatar
 
Join Date: Nov 2003
Location: Worcester, MA
Posts: 129

Bikes: 1977 Raleigh Professional, 1997 Milano 3v, 2004 Surly Karate Monkey, 2007 Surly Crosscheck, 1984 Hutch Pro Racer

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I wish it was just a simple matter of finding a roller cam brake, but roller cams, or U brakes, require the bosses to be mounted above the rim, while they are mounted below the rim on this frame.

Now if I could invent a spokeless wheel I could mount a roller cam or U brake upside down on the chainstays, and that would solve the problem.
Snordalisk is offline  
Old 05-06-07, 06:41 PM
  #5  
Snordalisk
Senior Member
Thread Starter
 
Snordalisk's Avatar
 
Join Date: Nov 2003
Location: Worcester, MA
Posts: 129

Bikes: 1977 Raleigh Professional, 1997 Milano 3v, 2004 Surly Karate Monkey, 2007 Surly Crosscheck, 1984 Hutch Pro Racer

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I just consulted an old copy of Barnett's, which states:

"If the spring hole in the braze-on is outboard of the stud, a special spring is required. For Shimano cantilevers, this spring will be square wire rather than round."
I'm bracing myself for the task of digging through a dozen parts boxes that might contain that "special spring", at least I know it exists now.

Sorry for the diversion, please go about your business.
Snordalisk 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.