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

Steel Fork Bent, Can It Be Repaired?

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.

Steel Fork Bent, Can It Be Repaired?

Old 05-12-20, 09:54 AM
  #1  
branko_76 
Senior Member
Thread Starter
 
branko_76's Avatar
 
Join Date: Jun 2018
Location: The Urban Shores Of Michigami
Posts: 1,059

Bikes: ........................................ .....Holdsworth "Special"..... .......Falcon "Special".......... .....Raleigh "Super GP"...... ........................................

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 401 Post(s)
Liked 277 Times in 190 Posts
Steel Fork Bent, Can It Be Repaired?

I realize that it would be better to replace the fork, but I would like to keep the bike original.

Is it possible to repair it?

There are no other visible signs of damage to the frame or fork, head-tube looks to be free of damage. It's nothing special, just high tension steel from a 1970's era Raleigh Super Grand Prix.

branko_76 is offline  
Old 05-12-20, 10:01 AM
  #2  
Doug Fattic 
framebuilder
 
Join Date: Dec 2009
Location: Niles, Michigan
Posts: 593
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 160 Post(s)
Likes: 0
Liked 183 Times in 94 Posts
Yes it makes sense to try and bend the blades back. The original straight fork blades were bent a lot to get the curve. Where do you live in Michigan? I'm in the SW corner just above South Bend Indiana if you want to bring it by. I've got all the tools and knowledge.
Doug Fattic is offline  
Old 05-12-20, 10:04 AM
  #3  
branko_76 
Senior Member
Thread Starter
 
branko_76's Avatar
 
Join Date: Jun 2018
Location: The Urban Shores Of Michigami
Posts: 1,059

Bikes: ........................................ .....Holdsworth "Special"..... .......Falcon "Special".......... .....Raleigh "Super GP"...... ........................................

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 401 Post(s)
Liked 277 Times in 190 Posts
Looks to be about a 2 hour drive to South Bend, I'm wondering if I can bend it back myself?

Although I'd love to see your shop.

Last edited by branko_76; 05-12-20 at 10:43 AM.
branko_76 is offline  
Old 05-12-20, 11:23 AM
  #4  
Doug Fattic 
framebuilder
 
Join Date: Dec 2009
Location: Niles, Michigan
Posts: 593
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 160 Post(s)
Likes: 0
Liked 183 Times in 94 Posts
The problem is to know when to bend until everything is in the right place. There are a lot of checks. For starters you need to bend both blades back until they have the same rake as they originally had. I have a fixture to accurately measure the rake. Then you have to check that both blades have the exact same rake and furthermore bend the blades so the dropouts are equidistant to the steerer's centerline. And finally you have to make sure that the dropout faces are exactly parallel to each other. For this we use Campy H tools. Park makes some dropout alignment tools but they are not accurate enough to my liking. And then we have to check with a true wheel to see that it centers. The rebending process may have made one blade longer than the other. A bit of filing can center the wheel again. And since one aspect can move after another one is bent, it is necessary to repeat the whole process until the fork passes all tests without more tweaking.

My frame shop is in Niles and you are welcome to come over as long as you don't bring the Coronavirus with you. I'll walk you through it. I'd be willing to bet that you could have driven back and forth several times in the time it would to figure out how to do it yourself with any accuracy.
Doug Fattic is offline  
Likes For Doug Fattic:
Old 05-12-20, 11:28 AM
  #5  
branko_76 
Senior Member
Thread Starter
 
branko_76's Avatar
 
Join Date: Jun 2018
Location: The Urban Shores Of Michigami
Posts: 1,059

Bikes: ........................................ .....Holdsworth "Special"..... .......Falcon "Special".......... .....Raleigh "Super GP"...... ........................................

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 401 Post(s)
Liked 277 Times in 190 Posts
Thank you. There's no urgency so when things cool down, hopefully soon, I'd love to stop by.
branko_76 is offline  
Old 05-12-20, 07:16 PM
  #6  
Andrew R Stewart 
Senior Member
 
Andrew R Stewart's Avatar
 
Join Date: Feb 2012
Location: Rochester, NY
Posts: 13,597

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: 2430 Post(s)
Liked 489 Times in 379 Posts
branko 76- I would strongly consider taking Doug up on his gracious offer. Besides repairing the fork and learning a lot along the way Doug is a really good person and I'm sure you'll enjoy his company. Andy
__________________
AndrewRStewart
Andrew R Stewart is online now  
Likes For Andrew R Stewart:
Old 05-23-20, 10:18 AM
  #7  
Sluggo
aspiring Old Wart
 
Sluggo's Avatar
 
Join Date: Oct 2005
Location: Left bank, Knoxville TN
Posts: 498
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Likes: 0
Liked 4 Times in 3 Posts
Messrs Fattic and Stewart are more knowledable than me, but it looks to me like the steerer is bent just above the fork crown. That is something that "nothing special" forks are vulnerable to. Not so easy to fix, but can be done with an appropriate mandrel.
Sluggo is offline  
Likes For Sluggo:
Old 05-23-20, 09:41 PM
  #8  
Andrew R Stewart 
Senior Member
 
Andrew R Stewart's Avatar
 
Join Date: Feb 2012
Location: Rochester, NY
Posts: 13,597

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: 2430 Post(s)
Liked 489 Times in 379 Posts
Hard to tell is the steerer is bent right at it's base or if the crown is where the twist is, besides the likely blade bends. I've "fixed" steerer bends (to a degree, pun intended) by re facing the crown race seat. Andy
__________________
AndrewRStewart
Andrew R Stewart is online now  
Old 05-31-20, 11:21 AM
  #9  
steve sumner
Senior Member
 
Join Date: Apr 2020
Posts: 210

Bikes: '68 Masi Special road, Grail bike

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 64 Post(s)
Likes: 0
Liked 41 Times in 34 Posts
branko, if you visit Doug ask him if b4 he got a fork alignment table
and jig did he ever use my spokes trick?
steve sumner is offline  
Old 05-31-20, 07:40 PM
  #10  
Andrew R Stewart 
Senior Member
 
Andrew R Stewart's Avatar
 
Join Date: Feb 2012
Location: Rochester, NY
Posts: 13,597

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: 2430 Post(s)
Liked 489 Times in 379 Posts
Originally Posted by steve sumner View Post
branko, if you visit Doug ask him if b4 he got a fork alignment table
and jig did he ever use my spokes trick?
Steve- Do tell us your spokes trick? Andy
__________________
AndrewRStewart
Andrew R Stewart is online now  
Old 06-01-20, 08:30 AM
  #11  
steve sumner
Senior Member
 
Join Date: Apr 2020
Posts: 210

Bikes: '68 Masi Special road, Grail bike

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 64 Post(s)
Likes: 0
Liked 41 Times in 34 Posts
clamp steerer in vise using blocks with blades horizontal. lay 4 or 5 spare sokes
across blades in intervals to use as a visual guide as to where to make corrections.
I learned it from Keith Lippy when he was the instructor at a regional occupational program
for bike repairs in 1972 in San Diego. worked in shops for 26 yrs. and straightened
at least 100 forks that way. tried to walk Branko thru the process on another forum
that's why I brought it up.
steve sumner is offline  
Old 06-01-20, 05:47 PM
  #12  
Andrew R Stewart 
Senior Member
 
Andrew R Stewart's Avatar
 
Join Date: Feb 2012
Location: Rochester, NY
Posts: 13,597

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: 2430 Post(s)
Liked 489 Times in 379 Posts
Steve- Good idea. Much like what I've done but with a few straight lengths of whatever was laying about. Never considered using spokes. Andy
__________________
AndrewRStewart
Andrew R Stewart is online now  
Old 06-02-20, 07:26 AM
  #13  
unterhausen
Randomhead
 
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 19,882
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 414 Times in 317 Posts
interesting variant on winding sticks https://www.google.com/search?q=wind...iw=877&bih=487
unterhausen is offline  
Old 06-02-20, 07:49 AM
  #14  
Andrew R Stewart 
Senior Member
 
Andrew R Stewart's Avatar
 
Join Date: Feb 2012
Location: Rochester, NY
Posts: 13,597

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: 2430 Post(s)
Liked 489 Times in 379 Posts
https://www.bikeforums.net/bicycle-m...ard-right.html Here's a link to my reply to a fork alignment thread many years ago. Some might find it interesting, others might not Andy
__________________
AndrewRStewart
Andrew R Stewart is online now  
Old 06-17-20, 08:49 PM
  #15  
aland2
Junior Member
 
Join Date: Mar 2019
Posts: 24
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Liked 13 Times in 6 Posts
When I was 17 a pakistani man drove a Datsun Sunny in front of my Lambretta Li 150 by doing a right turn.
It had a fork with a normal axle. Fork was bent back and the scooter's handling was severely compromised.
After my leg healed I removed the fork and stuck it in the drain grid outside the house and heaved on it until it looked right.
Job done.

Last edited by aland2; 06-17-20 at 09:12 PM.
aland2 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.