Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

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.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 01-29-09, 05:32 PM   #1
BAL
Senior Member
Thread Starter
 
Join Date: Aug 2004
Bikes:
Posts: 118
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Derailleur Hanger --- Maintenance?

I have an S-Works Roubaix that is 2 years old with about 9,000 miles on it. I have never touched the derailleur hanger.

Should I replace the hanger as a preventative maintenance matter?

It is recommended to remove it once in a while from the frame to check the interface between hanger and frame?

What torque is usually used on the single screw that holds the hanger to the frame/drop out?
BAL is offline   Reply With Quote
Old 01-29-09, 06:01 PM   #2
DOS
Senior Member
 
DOS's Avatar
 
Join Date: Feb 2008
Location: Arlington, VA USA
Bikes:
Posts: 1,468
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
It has never occurred to me to do preventative maintenance on a hanger absent some indication of a problem. I can't see a reason to replace one absent some indication of damage or after an accident where you susp[ect it took a good hit. Periodically eye ball for indications of damage (particularly if you've had a crash); make sure bolt is tight when you do any maintenance on the derailleur. As far as torque, attached will tell you how much to torque the deraileur mounting bolt (attches derailleur to hanger) but says nothing about how much to torque the hanger itself http://www.parktool.com/repair/howtos/torque.pdf. It probably depends on the hanger -- my Cannondale use two very small bolts for attaching the hanger to the frame that I found the hard waycan easily get stripped if tightened too much.

Last edited by DOS; 01-29-09 at 07:18 PM. Reason: Felt like it
DOS is offline   Reply With Quote
Old 01-29-09, 07:04 PM   #3
tatfiend 
Gear Hub fan
 
Join Date: Nov 2008
Location: Reno, NV
Bikes: Civia Hyland Rohloff, Swobo Dixon, Colnago, Univega
Posts: 2,830
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
There should be no wear on a derailleur hanger so no maintenance required unless it gets bent or the derailleur mounting hole gets stripped. For a removeable/replaceable hanger I would think that the only periodic maintenance woulld be making sure the hanger mounting screws are snug as well as the derailleur mounting bolt.
tatfiend is offline   Reply With Quote
Old 01-30-09, 12:22 AM   #4
wmodavis
Bill
 
Join Date: May 2007
Location: HIGHLANDS RANCH, CO
Bikes: Specialized Globe Sport, Specialized Stumpjumper FSR Pro
Posts: 630
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Not a bad idea to check the hanger alignment. Park has a tool for doing it or I'm sure your LBS can do it. On the other hand if it is shifting OK the alignment is probably OK as they go hand-in-hand.
wmodavis is offline   Reply With Quote
Old 01-30-09, 12:41 AM   #5
z415
Senior Member
 
z415's Avatar
 
Join Date: Apr 2006
Location: Gainesville/Tampa, FL
Bikes: Trek 1000, two mtbs and working on a fixie for commuting.
Posts: 2,343
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
^ I can attest that a hanger off by less than a millimeter will make it impossible to correctly use a full range of 9 gears. Probably worse on 10.
z415 is offline   Reply With Quote
Old 01-30-09, 01:23 AM   #6
Panthers007
Great State of Varmint
 
Panthers007's Avatar
 
Join Date: Sep 2008
Location: Dante's Third Ring
Bikes:
Posts: 7,479
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Something any top-end shop should consider purchasing:

http://www.parktool.com/products/det...=48&item=DAG-2

Or equivalent.
Panthers007 is offline   Reply With Quote
Old 01-30-09, 01:35 AM   #7
Chris_W
Gear Combo Guru
 
Chris_W's Avatar
 
Join Date: May 2007
Location: Switzerland
Bikes: Spec' Tarmac (road), Ridley Fenix (commuter & fast tourer), Salsa Mamasita (MTB), CoMo Speedster (tandem), Surly Big Dummy (cargo), Airnimal (folder)
Posts: 2,241
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The poor man's method of measuring derailluer hanger alignment is to find a wheel whose axle has the right size thread and mount that to the derailleur, then do some measurements (the first wheel I tried worked).

With the bike's own rear wheel in place, remove the rear derailleur. Thread the other wheel onto the derailleur hanger where the derailleur would normally mount. You can then measure the lateral distance between the two rims at various points (not the easiest thing to do, but try as best as you can) and if these measurements are all equal then the hanger is correctly aligned. Obviously, both rims need to be laterally true for this to work.

Unfortunately, it's not a very accurate method, but I believe it is the most accurate method you can do at home without a fancy tool.

Last edited by Chris_W; 01-30-09 at 06:48 AM.
Chris_W is offline   Reply With Quote
Old 02-12-09, 09:07 PM   #8
Troublegum
Member
 
Join Date: Nov 2006
Location: KY
Bikes:
Posts: 31
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I wouldn't replace it preventativly unless you are having a problem with it. It should also be noted that even though there are bolts holding it to the frame when the wheel is off, the hanger is held in place mostly by the pressure of the wheel being mounted. So there is very little wear on a hanger unless it takes a hit.
Troublegum is offline   Reply With Quote
Old 02-13-09, 12:05 AM   #9
neil0502
My bike's better than me!
 
neil0502's Avatar
 
Join Date: Feb 2005
Location: Northern Colorado
Bikes: (2) Moots Vamoots, (1) Cannondale T2000 tourer, (1) Diamondback Response Comp mtb
Posts: 2,041
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I never messed with my der hangers ... until I finally KNEW that I had bent one ... and broke down and bought the Park Tool tool.

Neat.

Once I fixed the bent one, I checked the alignment on the others. Too true: a slightly mis-aligned der hanger was responsible for degraded shifting ... that I didn't even realize WAS degraded ... until I got them perfectly aligned.

If you'll use the tool on multiple bikes or for work, buy it. If not, get your trusted LBS to align the sucker for you....
neil0502 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -6. The time now is 01:01 PM.