Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

Using a Ultegra triple front derailleur on 52/42/30(28) but cage hits the 42T ring

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.

Using a Ultegra triple front derailleur on 52/42/30(28) but cage hits the 42T ring

Old 07-19-13, 12:32 AM
  #1  
bobotech
Senior Member
Thread Starter
 
Join Date: Jan 2012
Location: Spokane, WA
Posts: 2,253

Bikes: Specialized Sequoia Elite/Motobecane Fantom Cross Team Ti/'85 Trek 520

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Using a Ultegra triple front derailleur on 52/42/30(28) but cage hits the 42T ring

Okay, I'm building another frankinbike. Giant TCX cross frame. I'm putting a triple on it (I like triples). I'm using an Octalink Shimano 105 crankset with a 52/42/30 chainrings however I swapped out the 30t ring for a 28t for now. I am using an XTR rear derailleur (its the nicest I had in my junk bin) and an Ultegra FD-6603 front triple derailleur band clamp style.

The weirdness is in how I try to set the front derailleur. If I set it so the cage properly is about a mm away from the large chainring (nickle thickness or so), when I move the cage out as to shift to the larger rings, the lower inside portion of the cage hits the 42T middle chainring.

I have to raise the front derailleur up to about 5mm away from the 52t chainring for the lower inside portion of the cage to not hit the 42t chainring. That doesn't seem right to me. What am I missing?

This happened to me once before with a different bike (same setup). The first Ultegra front derailleur hit the 42t chainring but I had a different one and used it and that one had a smaller inner cage and didn't hit. I don't have that luxury now.

This might sound crazy but can I safely mill off a small portion of the inner cage to allow the clearance?
bobotech is offline  
Old 07-19-13, 12:50 AM
  #2  
cobba
Senior Member
 
Join Date: Aug 2006
Posts: 1,655
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 88 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
Minimum difference between top and intermediate chainrings is 13 teeth with the FD-6603.

http://techdocs.shimano.com/media/te...9830616213.pdf
cobba is offline  
Old 07-19-13, 12:52 AM
  #3  
Bezalel
Senior Member
 
Join Date: Mar 2010
Location: City of Brotherly Love
Posts: 1,561

Bikes: Raleigh Companion, Nashbar Touring, Novara DiVano, Trek FX 7.1, Giant Upland

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 19 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
That derailleur is not designed for that crankset, it's designed for a 52/39/30. The maximum tooth difference is 22 teeth and the minimum difference between top and intermediate is 13 teeth.
Bezalel is offline  
Old 07-19-13, 12:58 AM
  #4  
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
different FD?
fietsbob is offline  
Old 07-19-13, 02:19 AM
  #5  
bobotech
Senior Member
Thread Starter
 
Join Date: Jan 2012
Location: Spokane, WA
Posts: 2,253

Bikes: Specialized Sequoia Elite/Motobecane Fantom Cross Team Ti/'85 Trek 520

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Well poo. That explains it. I found another Ultegra derailleur but it is a FD-6503 and in my parts bin but this one is a 31.8 clamp and I need the 34.9 clamp. It does have the smaller cage that will work with my crankset.

I guess I can dig around and see if I can find a 39t chainring.
bobotech is offline  
Old 07-19-13, 05:05 AM
  #6  
bradtx
Senior Member
 
Join Date: Jun 2010
Location: Pearland, Texas
Posts: 7,580

Bikes: Cannondale, Trek, Raleigh, Santana

Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 304 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
bobotech, Make sure that the FD isn't a braze-on style using an adapter clamp.

Brad
bradtx is offline  
Old 07-19-13, 05:29 AM
  #7  
dsbrantjr
Senior Member
 
dsbrantjr's Avatar
 
Join Date: Sep 2010
Location: Roswell, GA
Posts: 6,119

Bikes: '93 Trek 750, '92 Schwinn Crisscross, '93 Mongoose Alta

Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 613 Post(s)
Likes: 0
Liked 18 Times in 18 Posts
"It does have the smaller cage that will work with my crankset."
It is not just the cage size but also the angle at which it swings down as it moves inwards from the large ring. This one moves down more steeply to better follow the intended smaller ring than one designed for a 52/42 combination. This is set by the geometry of the parallelogram linkage so you may not be able to remove sufficient material to make it clear without weakening it.
dsbrantjr is offline  
Old 07-19-13, 05:32 AM
  #8  
bhchdh 
Senior Member
 
bhchdh's Avatar
 
Join Date: May 2003
Location: Hampton Roads VA
Posts: 1,788

Bikes: '07 Trek 520, '09 Gary Fisher Triton, '04 Trek 8000, '85 Trek 500, '84 Trek 610, '85 Trek 510, '88 Trek 660, '92 Trek 930, Trek Multitrack 700

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 19 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I run an Ultegra 52/42/30 crank set with a 105 triple (5503?) front derailuer and an XTR Rd.
__________________
"When I hear another express an opinion, which is not mine, I say to myself, He has a right to his opinion, as I to mine; why should I question it. His error does me no injury, and shall I become a Don Quixot to bring all men by force of argument, to one opinion? If a fact be misstated, it is probable he is gratified by a belief of it, and I have no right to deprive him of the gratification."

T. Jefferson
bhchdh is offline  
Old 07-19-13, 06:27 AM
  #9  
bradtx
Senior Member
 
Join Date: Jun 2010
Location: Pearland, Texas
Posts: 7,580

Bikes: Cannondale, Trek, Raleigh, Santana

Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 304 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by bhchdh View Post
I run an Ultegra 52/42/30 crank set with a 105 triple (5503?) front derailuer and an XTR Rd.
Your FD allows you to use the 42T, or a 39T middle chain ring. The X6XX series FD apparently has more lateral movement than the X5XX series and the 42T chain ring is interfering with it.

Brad
bradtx is offline  
Old 07-19-13, 05:04 PM
  #10  
bhchdh 
Senior Member
 
bhchdh's Avatar
 
Join Date: May 2003
Location: Hampton Roads VA
Posts: 1,788

Bikes: '07 Trek 520, '09 Gary Fisher Triton, '04 Trek 8000, '85 Trek 500, '84 Trek 610, '85 Trek 510, '88 Trek 660, '92 Trek 930, Trek Multitrack 700

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 19 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by bradtx View Post
Your FD allows you to use the 42T, or a 39T middle chain ring. The X6XX series FD apparently has more lateral movement than the X5XX series and the 42T chain ring is interfering with it.

Brad
Understood. I was trying to point out that the 105 FD could be another option for the OP.
__________________
"When I hear another express an opinion, which is not mine, I say to myself, He has a right to his opinion, as I to mine; why should I question it. His error does me no injury, and shall I become a Don Quixot to bring all men by force of argument, to one opinion? If a fact be misstated, it is probable he is gratified by a belief of it, and I have no right to deprive him of the gratification."

T. Jefferson
bhchdh is offline  
Old 07-19-13, 06:02 PM
  #11  
bradtx
Senior Member
 
Join Date: Jun 2010
Location: Pearland, Texas
Posts: 7,580

Bikes: Cannondale, Trek, Raleigh, Santana

Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 304 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by bhchdh View Post
Understood. I was trying to point out that the 105 FD could be another option for the OP.
I know. The OP needs to know that if he wants to keep the 42T middle he'll have to find a X5XX series triple FD. Otherwise source a 39T middle chain ring.

Brad
bradtx 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.