HOT: Active* forum members generally gain 5% discount at starbike.com store!
Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Articles FAQ Contact About




Post new topic Reply to topic  [ 8 posts ] 
Author Message
PostPosted: Wed Jun 13, 2012 7:30 am 
Offline
User avatar

Joined: Tue Mar 20, 2007 5:07 pm
Posts: 229
Location: Palo Alto, CA
Been dialing in my new Madone ('12 6.9SSL) since I built it up a couple weeks ago. It's almost perfect but the rear shifting was just a little off. Nothing major, just some extra noise and the shifting wasn't as crisp/consistent as it should be. So, I checked and rechecked the cable tension, housing lengths (have gone up/down with bar height a bit), limit screw and "b" screw adjustments, wheel true, etc. and the setup is spot-on.

Hadn't checked the derailleur hanger alignment b/c the shifting was alright and I'd spaced on it, so checked the hanger bolts then threw the ol' alignment tool on there and found the hanger was waaay off. I've aligned hangers for years and broken a few (like all mechanics), and through trial and error have developed a decent sense for how much force you can/should apply. I'm especially careful with aluminum hangers on carbon frames as they can only be straightened a tiny amount before weakening and snapping. Anyhow, I figured the Madone hanger was a brittle aluminum number and tho' I didn't have a spare on hand, threw caution to the wind and for the hell of it did a very tiny (think 2-3 NM) torqueing with my tool - not enough to do much, if anything, to most hangers I've had. Surprisingly, the hanger came all the way into perfect true with this one small action. I checked it several times at 12-3-6-9 and it's perfect. The shifting seems flawless now, as well, at least on the stand (will ride it on the road tomorrow).

The hanger appears to be painted or clear-coated and, while I assume it's aluminum, I recall recent discussion about Trek experimenting with steel hangers on Madones for ease of alignment. Lots of flame-throwing on the boards about how that'd result in broken frames, defeats the purpose of a hanger, etc. However, I'm very curious to know what this hanger is made out of. Feels like steel. Maybe it's a softer aluminum compound that is designed to break but is soft enough to be adjustable? All I can say is it's way softer than the hard aluminum hangers I've had on my last 4 or 5 race bikes (e.g., Super6 hangers that'd snap if you looked too hard at them).

Cheers!


Top
 Profile  
 
Posted: Wed Jun 13, 2012 7:30 am 


Top
  
 
PostPosted: Wed Jun 13, 2012 10:30 am 
Offline

Joined: Wed Mar 17, 2004 1:38 pm
Posts: 1248
Stick a magnet near it. If it's steel it'll stick. If it's aluminum it won't.


Top
 Profile  
 
PostPosted: Wed Jun 13, 2012 10:36 am 
Offline

Joined: Thu May 03, 2012 7:58 am
Posts: 31
Location: North Carolina
I'm pretty sure the hanger is aluminum, I have the same frame and I watched my mechanic adjust it easily. The steel hangers were only given to pro teams to give crisper shifting, I believe.


Top
 Profile  
 
PostPosted: Wed Jun 13, 2012 10:41 am 
Offline

Joined: Fri Mar 23, 2012 8:56 am
Posts: 25
Location: lancashire UK
Dont forget Titanium and stainless steel are non magnetic but a S/S hanger never !

Barrie


Top
 Profile  
 
PostPosted: Wed Jun 13, 2012 11:03 am 
Offline
User avatar

Joined: Sun Dec 28, 2008 10:15 pm
Posts: 1199
Location: Hungary
take it off, weight it, then measure the weight of water it displaces from a glass. Calculate density and voila. ;) A bit easier solution is to ask Trek. :)


Top
 Profile  
 
PostPosted: Wed Jun 13, 2012 1:11 pm 
Offline

Joined: Sat Dec 13, 2003 2:25 am
Posts: 4438
Location: Canada
Or, just take it off and feel it...


Top
 Profile  
 
PostPosted: Wed Jun 13, 2012 3:57 pm 
Offline
User avatar

Joined: Tue Mar 20, 2007 5:07 pm
Posts: 229
Location: Palo Alto, CA
Duh, Magnet, great idea (prefer not to take hangers on/off once aligned as tiny bolts are easy to start rounding even when careful). Did it, no stick. So, aluminum as we all suspected. Still, darn thing is quite malleable, at least relative to most alu hangers. Anyone know if Trek designed this in as a compromise between normal alu and steel? Thanks, all.


Top
 Profile  
 
Posted: Wed Jun 13, 2012 3:57 pm 


Top
  
 
PostPosted: Thu Jun 14, 2012 6:01 pm 
Offline

Joined: Sat May 07, 2011 12:23 am
Posts: 157
The Steel hangers were a team-only part Trek fabricated for the pros, who could care less about trashing frames. I don't believe any bikes were sold publicly with those bits.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 8 posts ] 


Who is online

Users browsing this forum: Bing [Bot], Exabot [Bot], Google [Bot], IchDien, prebsy, tompho and 51 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. Broke the derailleur hanger on my Trek 5200

[ Go to page: 1, 2 ]

in Road

jspaceman

27

1014

Wed May 07, 2014 10:10 pm

crimsonbadger View the latest post

There are no new unread posts for this topic. Derailleur hanger for Cervelo RCA

[ Go to page: 1, 2 ]

in Road

audiophilitis

16

755

Mon Feb 17, 2014 1:46 am

audiophilitis View the latest post

There are no new unread posts for this topic. Colnago C59 Derailleur Hanger Problems

in Road

alexaqui

3

299

Tue May 27, 2014 5:40 pm

Svetty View the latest post

There are no new unread posts for this topic. Trek Madone vs Domane

in Road

benhama

6

2848

Wed Oct 09, 2013 12:27 pm

benhama View the latest post

There are no new unread posts for this topic. Trek Madone 7 Series

in Road

benhama

8

1554

Wed Aug 14, 2013 11:10 pm

afalts View the latest post


It is currently Wed Jul 23, 2014 4:05 am

All times are UTC + 1 hour




Advertising   –  FAQ   –  Contact   –  Convert   –  About

© Weight Weenies 2000-2013
hosted by starbike.com


How to get rid of these ads? Just register!


Powered by phpBB