Go Back  Bike Forums > Bike Forums > General Cycling Discussion
Reload this Page >

New Derailleur Hanger vs. Hanger Alignment Tool

General Cycling Discussion Have a cycling related question or comment that doesn't fit in one of the other specialty forums? Drop on in and post in here! When possible, please select the forum above that most fits your post!

New Derailleur Hanger vs. Hanger Alignment Tool

Old 10-15-15, 04:38 AM
  #1  
drock79
Senior Member
Thread Starter
 
Join Date: Mar 2014
Posts: 63
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
New Derailleur Hanger vs. Hanger Alignment Tool

Can someone answer a question I have concerning bent derailleur hangers. If you think your hanger is bent why would you spend upwards of $60-$70 for a tool when you can simply replace the hanger for a fraction of that cost?
drock79 is offline  
Old 10-15-15, 04:43 AM
  #2  
Homebrew01
Super Moderator
 
Homebrew01's Avatar
 
Join Date: Jul 2004
Location: Ffld Cnty Connecticut
Posts: 21,027

Bikes: Old Steelies I made, Old Cannondales

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 787 Post(s)
Likes: 0
Liked 17 Times in 16 Posts
Because then you can straighten any hanger, any time, forever.
__________________
Bikes: Old steel race bikes, old Cannondale race bikes, less old Cannondale race bike, crappy old mtn bike.

FYI: http://www.bikeforums.net/forum-sugg...ad-please.html
Homebrew01 is online now  
Old 10-15-15, 05:38 AM
  #3  
Lazyass
Senior Member
 
Lazyass's Avatar
 
Join Date: Jul 2008
Location: NC
Posts: 8,183

Bikes: Vintage steel, aluminum, modern carbon disc, single speed, MTB's, the works

Mentioned: 58 Post(s)
Tagged: 0 Thread(s)
Quoted: 1909 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
If you have a spare wheel with a hub threaded on the ends use can use that as an alignment tool. Unbolt the rear derailleur and thread the hub right in then measure between the two rims at different points. It worked for me after I could never get my 6700 tuned right. The hanger was bent a couple of millimeters.

https://www.youtube.com/watch?v=T45tsSjyjDA
Lazyass is offline  
Old 10-15-15, 05:40 AM
  #4  
demoncyclist
Senior Member
 
demoncyclist's Avatar
 
Join Date: Oct 2002
Location: Medway, MA
Posts: 2,728

Bikes: 2011 Lynskey Sportive, 1988 Cannondale SM400

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 19 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Because not every frame has a replaceable hanger.
demoncyclist is offline  
Old 10-15-15, 07:47 AM
  #5  
Slash5
Senior Member
 
Join Date: Feb 2014
Location: Southern Ontario
Posts: 1,890
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 258 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
It's worth using the alignment tool on new hangers - they are not precision items plus usually something destructive happened to require replacement. If you watch the sales you can get the tool around $50 and hangers usually seem to run $20. With multiple bikes plus mostly steel bikes it's not a bad investment. Plus it's a tool - nothing wrong with more tools.
Slash5 is offline  
Old 10-15-15, 07:52 AM
  #6  
drock79
Senior Member
Thread Starter
 
Join Date: Mar 2014
Posts: 63
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
thanks for the insight, i do have a steel bike with a hanger that isn't replaceable, perhaps i add the tool to my christmas list
drock79 is offline  
Old 10-15-15, 08:04 AM
  #7  
JohnDThompson 
Old fart
 
JohnDThompson's Avatar
 
Join Date: Nov 2004
Location: Appleton WI
Posts: 20,345

Bikes: Several, mostly not name brands.

Mentioned: 106 Post(s)
Tagged: 0 Thread(s)
Quoted: 1662 Post(s)
Liked 36 Times in 22 Posts
Originally Posted by drock79 View Post
Can someone answer a question I have concerning bent derailleur hangers. If you think your hanger is bent why would you spend upwards of $60-$70 for a tool when you can simply replace the hanger for a fraction of that cost?
Sometimes the dropout has also bent, in which case simply replacing the hanger onto a bent dropout wouldn't solve the alignment problem.
JohnDThompson is offline  
Old 10-15-15, 08:06 AM
  #8  
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 41,464

Bikes: 8

Mentioned: 183 Post(s)
Tagged: 0 Thread(s)
Quoted: 6721 Post(s)
Likes: 0
Liked 139 Times in 117 Posts
+1) out of the box, replacing a bent hanger is not guaranteed to be in alignment just because it is replaceable,

but .. the service charge for the BikeShop to do the post replacement alignment is not pricy.
fietsbob is offline  
Old 10-15-15, 09:48 AM
  #9  
series1811
Senior Member
 
Join Date: Aug 2015
Posts: 246

Bikes: 2015 Cannondale SuperSix EVO 105, 2012 Fuji Roubaix, 1988 Basso Gap

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Homebrew01 View Post
Because then you can straighten any hanger, any time, forever.
This. Metal fatigue is an old wive's tale. Especially with the harder aluminum alloys used to make dropout hangers. Bending them only makes them stronger, not weaker.
series1811 is offline  
Old 10-15-15, 09:57 AM
  #10  
JonathanGennick 
Senior Member
 
JonathanGennick's Avatar
 
Join Date: Apr 2007
Location: Munising, Michigan, USA
Posts: 3,986

Bikes: Priority 600, Priority Continuum, Devinci Dexter

Mentioned: 14 Post(s)
Tagged: 0 Thread(s)
Quoted: 632 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
New Derailleur Hanger vs. Hanger Alignment Tool

The tool lets you know for certain. There is value in the knowing. It makes diagnostic work faster and easier. Checking alignment is often first on my list when someone presents with a shifting problem. Especially if the onset was sudden.
JonathanGennick is offline  
Old 10-16-15, 07:17 AM
  #11  
BlazingPedals
Senior Member
 
BlazingPedals's Avatar
 
Join Date: Dec 2004
Location: Middle of da Mitten
Posts: 10,900

Bikes: Trek 7500, RANS V-Rex, Optima Baron, Velokraft NoCom, M-5 Carbon Highracer, homebuilt recumbent

Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 883 Post(s)
Liked 12 Times in 10 Posts
Originally Posted by series1811 View Post
This. Metal fatigue is an old wive's tale. Especially with the harder aluminum alloys used to make dropout hangers. Bending them only makes them stronger, not weaker.
Bending aluminum work-hardens it, but it doesn't make it STRONGER. A subtle but important distinction.
BlazingPedals is offline  
Old 10-16-15, 07:20 AM
  #12  
andr0id
Senior Member
 
andr0id's Avatar
 
Join Date: Feb 2009
Posts: 2,526
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 1419 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by drock79 View Post
Can someone answer a question I have concerning bent derailleur hangers. If you think your hanger is bent why would you spend upwards of $60-$70 for a tool when you can simply replace the hanger for a fraction of that cost?
A new removable hanger may not be badly bent, but will still need to be aligned to the frame and you need the tool for that.
andr0id is offline  
Old 10-16-15, 07:42 AM
  #13  
Retro Grouch 
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Posts: 29,254

Bikes: Catrike 559 I own some others but they don't get ridden very much.

Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 1142 Post(s)
Liked 20 Times in 16 Posts
Originally Posted by JonathanGennick View Post
The tool lets you know for certain. There is value in the knowing. It makes diagnostic work faster and easier. Checking alignment is often first on my list when someone presents with a shifting problem. Especially if the onset was sudden.
I think so too. Whenever I encounter a rear shifting issue that doesn't respond to normal tuning, the first thing that I do is to check the derailleur hanger alignment. Most times that's the root cause of the problem. Even if it isn't it's well worth it to me to rule out a mis-aligned hanger as the problem.

I've owned my Park derailleur hanger alignment tool for over 25 years. I've told people that it's my favorite tool because using it has convinced several people that I'm a smarter bike mechanic than I really am.
__________________
My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.
Retro Grouch is offline  
Old 10-16-15, 10:02 AM
  #14  
series1811
Senior Member
 
Join Date: Aug 2015
Posts: 246

Bikes: 2015 Cannondale SuperSix EVO 105, 2012 Fuji Roubaix, 1988 Basso Gap

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by BlazingPedals View Post
Bending aluminum work-hardens it, but it doesn't make it STRONGER. A subtle but important distinction.
You missed the sarcasm. To be clear, bent derailleur hangers should be replaced, not straightened and re-used.
series1811 is offline  
Old 10-16-15, 10:08 AM
  #15  
79pmooney
A Roadie Forever
 
79pmooney's Avatar
 
Join Date: Oct 2014
Location: Portland, OR
Posts: 6,805

Bikes: (2) ti TiCycles, 2007 w/ triple and 2011 fixed, 1979 Peter Mooney, ~1983 Trek 420 now fixed and ~1973 Raleigh Carlton Competition gravel grinder

Mentioned: 89 Post(s)
Tagged: 0 Thread(s)
Quoted: 1594 Post(s)
Likes: 0
Liked 36 Times in 29 Posts
For all but two of the 13 or so bikes I have owned, every hanger has come as an assembly costing between $50 and $500. Real hassles to change out. Bending them back to straight is SO much simpler.

Ben
79pmooney is offline  
Old 10-17-15, 09:35 AM
  #16  
Looigi
Senior Member
 
Looigi's Avatar
 
Join Date: Dec 2010
Posts: 8,951
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
It's perfectly fine to straighten a moderately bent hanger, once anyway. After a couple of times it will be more likely to break. An alignment tool is nice, but not really necessary. Laying a good straightedge, like a 16" steel machinist's rule, on the part where the derailleur tightens against and eyeballing it vertically and horizontally compared to the frame can get you plenty close enough.
Looigi is offline  
Old 10-17-15, 09:48 AM
  #17  
JohnDThompson 
Old fart
 
JohnDThompson's Avatar
 
Join Date: Nov 2004
Location: Appleton WI
Posts: 20,345

Bikes: Several, mostly not name brands.

Mentioned: 106 Post(s)
Tagged: 0 Thread(s)
Quoted: 1662 Post(s)
Liked 36 Times in 22 Posts
Originally Posted by Looigi View Post
It's perfectly fine to straighten a moderately bent hanger, once anyway. After a couple of times it will be more likely to break. An alignment tool is nice, but not really necessary. Laying a good straightedge, like a 16" steel machinist's rule, on the part where the derailleur tightens against and eyeballing it vertically and horizontally compared to the frame can get you plenty close enough.
The benefit of the proper alignment tool is that it allows you to determine how the hanger is bent, and fix it in a single operation more readily the straight-edge-and-eyeball method. Keep in mind that steel hangers are much more tolerant of repeated bending than aluminum hangers, and friction shifting is more forgiving of misalignment than indexed shifting.
JohnDThompson is offline  
Old 10-18-15, 02:05 PM
  #18  
rydabent
Senior Member
 
Join Date: Apr 2010
Location: Lincoln Ne
Posts: 7,518

Bikes: RANS Stratus TerraTrike Tour II

Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 1312 Post(s)
Liked 11 Times in 10 Posts
Originally Posted by JohnDThompson View Post
Sometimes the dropout has also bent, in which case simply replacing the hanger onto a bent dropout wouldn't solve the alignment problem.
Bingo!!!!
rydabent is offline  
Old 10-19-15, 10:47 AM
  #19  
Leebo
Senior Member
 
Join Date: Aug 2009
Location: North of Boston
Posts: 5,415

Bikes: Kona Dawg, Surly 1x1, Karate Monkey, Rockhopper, Crosscheck , Burley Runabout,

Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 739 Post(s)
Likes: 0
Liked 9 Times in 7 Posts
Originally Posted by series1811 View Post
This. Metal fatigue is an old wive's tale. Especially with the harder aluminum alloys used to make dropout hangers. Bending them only makes them stronger, not weaker.
Umm,replaceable derailleur hangers are meant to break, they usually are made of cheap stuff. Bending back an aluminum hanger is poor advice. My reference is on mt bikes. Where the hangers are supposed to break, saving your derailleur.
Leebo is offline  
Old 10-19-15, 01:35 PM
  #20  
series1811
Senior Member
 
Join Date: Aug 2015
Posts: 246

Bikes: 2015 Cannondale SuperSix EVO 105, 2012 Fuji Roubaix, 1988 Basso Gap

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Homebrew01 View Post
Because then you can straighten any hanger, any time, forever.
Originally Posted by series1811 View Post
This. Metal fatigue is an old wive's tale. Especially with the harder aluminum alloys used to make dropout hangers. Bending them only makes them stronger, not weaker.
Originally Posted by series1811 View Post
You missed the sarcasm. To be clear, bent derailleur hangers should be replaced, not straightened and re-used.
Originally Posted by Leebo View Post
Umm,replaceable derailleur hangers are meant to break, they usually are made of cheap stuff. Bending back an aluminum hanger is poor advice. My reference is on mt bikes. Where the hangers are supposed to break, saving your derailleur.
Looks like you missed the sarcasm too. My original post was in response to homebrew's sarcastic post that you can straighten and reuse derailleur hangers.

The aluminum in the hangers is actually high quality. It is just alloyed to be stiffer and more brittle to perform as you indicated.
series1811 is offline  
Old 07-04-16, 12:28 PM
  #21  
bigskydrift
Junior Member
 
Join Date: Jan 2016
Location: Missoula, MT.
Posts: 14

Bikes: 2015 Cannondale Synapse Tiagra Disc 6; 2010 Diamondback Trace;

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
so, I just purchased the Park Tool DAG-2.2 Derailleur Hanger Alignment tool. After ordering I was looking at Cannondale's website, and it states "Cannondale strongly advises against trying to straighten their hangers as they are stiffer and more brittle than typical derailleur hangers. The risk is that they will shear off after the integrity has been compromised. Also, NEVER try to straighten one in the bike as it could tear out the mounting bolts/holes in the frame." I have a 2015 CD Synapse.....should I cancel tool order and buy a new hanger ??
bigskydrift is offline  
Old 07-04-16, 01:13 PM
  #22  
tomato coupe
Senior Member
 
Join Date: Jul 2009
Posts: 419

Bikes: Colnago, Van Dessel, Ridley, Kona

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 228 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by series1811 View Post
Looks like you missed the sarcasm too. My original post was in response to homebrew's sarcastic post that you can straighten and reuse derailleur hangers.

The aluminum in the hangers is actually high quality. It is just alloyed to be stiffer and more brittle to perform as you indicated.
Maybe you should edit your post and explicitly state that you're being sarcastic. I believe you, yet it still doesn't come across as sarcasm to me. In the meantime, most people probably either:

1. Think you made a stupid statement. (most)
2. Think what you said is true. (some)
3. Detected the sarcasm. (few)

Cheers
tomato coupe is offline  
Old 07-04-16, 02:35 PM
  #23  
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 41,464

Bikes: 8

Mentioned: 183 Post(s)
Tagged: 0 Thread(s)
Quoted: 6721 Post(s)
Likes: 0
Liked 139 Times in 117 Posts
Originally Posted by drock79 View Post
Can someone answer a question I have concerning bent derailleur hangers. If you think your hanger is bent why would you spend upwards of $60-$70 for a tool when you can simply replace the hanger for a fraction of that cost?
Both .. even if you buy a New replacable derailleur hanger that act does not guarantee it will be in alignment.

You still have to do the alignment check after you replace It.

(Or bring the bike By the LBS and have them check it with their tool for a few Bucks.)

Last edited by fietsbob; 07-04-16 at 02:39 PM.
fietsbob 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.