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

126mm dropouts cold set to 135, opinions?

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.

126mm dropouts cold set to 135, opinions?

Old 07-29-14, 03:19 PM
  #1  
Barrettscv 
Have bike, will travel
Thread Starter
 
Barrettscv's Avatar
 
Join Date: Feb 2006
Location: Lake Geneva, WI
Posts: 12,025

Bikes: Ridley Helium SLX, Canyon Endurance SL, De Rosa Professional, Eddy Merckx Corsa Extra, Schwinn Paramount (1 painted, 1 chrome), Peugeot PX10, Serotta Nova X, Simoncini Cyclocross Special, Raleigh Roker, Pedal Force CG2 and CX2

Mentioned: 42 Post(s)
Tagged: 0 Thread(s)
Quoted: 721 Post(s)
Liked 19 Times in 11 Posts
126mm dropouts cold set to 135, opinions?

I have a 1988 Miyata 615 touring bike. I'd like to update the bike with modern 135mm touring wheels.

The Miyata has longer 445mm chainstays and is a heavier touring frame, by 1988 standards.

There are a couple of professional frame builders in my area who could cold set the rear triangle and correctly align the frame.

The question is: will the frame survive the bending with 100% integrity?
__________________
When I ride my bike I feel free and happy and strong. I'm liberated from the usual nonsense of day to day life. Solid, dependable, silent, my bike is my horse, my fighter jet, my island, my friend. Together we will conquer that hill and thereafter the world.
Barrettscv is offline  
Old 07-29-14, 04:03 PM
  #2  
unterhausen
Randomhead
 
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 18,107
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 19 Times in 19 Posts
that shouldn't be a problem. I've gone further than that without issue

It was really common at one point to go from 120 to 130, and I've never seen anyone reporting an issue with that. Later bikes with heat treated tubing may well have a problem
unterhausen is offline  
Old 07-30-14, 06:01 PM
  #3  
squirtdad
Senior Member
 
squirtdad's Avatar
 
Join Date: Jul 2006
Location: San Jose (Willow Glen) Ca
Posts: 6,055

Bikes: 90/91 De Rosa, '84 Team Miyata, '82 nishiski,

Mentioned: 52 Post(s)
Tagged: 0 Thread(s)
Quoted: 786 Post(s)
Liked 17 Times in 14 Posts
I used the sheldon brown 2x4 method to coldset a a nishiki to 135.....so I don't see a problem.... assuming you are talking steel frame..... 4.5 mm per side so about 3/16 " on each side
__________________
Looking for Team Miyata F&F 58cm
squirtdad is offline  
Old 07-30-14, 07:30 PM
  #4  
Mark Kelly 
Senior Member
 
Mark Kelly's Avatar
 
Join Date: Oct 2009
Location: Willy, VIC
Posts: 644
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
According to this catalogue the 1988 615 is made from triple butted CrMo tubing. They make no mention of it being heat treated so you should be fine.
Mark Kelly is offline  
Old 07-30-14, 07:59 PM
  #5  
Andrew R Stewart 
Senior Member
 
Andrew R Stewart's Avatar
 
Join Date: Feb 2012
Location: Rochester, NY
Posts: 11,546

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: 1695 Post(s)
Likes: 0
Liked 23 Times in 20 Posts
The most likely bad thing is that the brake bridge will break loose from a stay. But these frames were brass brazed and with that the joint strength is high and the heat affected zone is large. So I doubt that there will be an issue. The drops will need realigning after the spread. Andy.
Andrew R Stewart is online now  
Old 07-30-14, 11:13 PM
  #6  
MassiveD
Senior Member
 
Join Date: Jul 2011
Posts: 2,434
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 31 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
It is done a lot, and usually with a lot less care than you are proposing.

I don't really like it from a framebuilding perspective. If I had an old jig that had a 126 rear spread on it, and said no problem I can just bend the frames to 135, I don't think most builder would think that was a great way to proceed. If I did that, I could build closer to the final dimensions than spreading an old frame. So if as a group we stand for making things with greater care than this shortcut implies, why are we the place to ask about this kind of thing, and why would we hand out the advice? Leave it to the guys with the 2x4s.
MassiveD is offline  
Old 07-31-14, 07:54 AM
  #7  
Dave Kirk 
Senior Member
 
Join Date: Sep 2006
Location: Bozeman MT
Posts: 200

Bikes: Kirk

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I think you'd be fine.

dave
Dave Kirk is offline  
Old 08-01-14, 09:48 AM
  #8  
cycle_maven
Collector of Useless Info
 
Join Date: Aug 2009
Posts: 1,407
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
No problem- I believe the 615 had "mangalloy" stays, which take cold setting a lot easier than Chrome-moly.
cycle_maven 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

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