Go Back  Bike Forums > Bike Forums > Road Cycling
Reload this Page >

Compact cranks - Front derailleur issues

Notices
Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

Compact cranks - Front derailleur issues

Old 08-02-05, 10:11 PM
  #1  
SpongeDad
Overacting because I can
Thread Starter
 
SpongeDad's Avatar
 
Join Date: Jan 2005
Location: The Mean Streets of Bethesda, MD
Posts: 4,552

Bikes: Merlin Agilis, Trek 1500

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Compact cranks - Front derailleur issues

Anyone ever have any problems with a 50/34 compact and a standard Shimano or Campy front derailleur.

FSA has a compact FD on the market, and I was wondering if it's really an advance on what's already out there.
SpongeDad is offline  
Old 08-02-05, 10:30 PM
  #2  
Roadie Rob
Bike Nut
 
Roadie Rob's Avatar
 
Join Date: Dec 2004
Location: Wisconsin
Posts: 81

Bikes: 16 and counting

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Not worth it my opinion. I switched to a compact carbon crank (50/34) just before the Triple Bypass in Colorado. I kept my Dura Ace front derailleur (lowered by 1/2 inch on the seat tube) and it shifted fine between the climbs and descents (and minor flat spots on occassion).

It's just a marketing ploy...stay away from the evil marketiong folks in cycling!!! Remember, they are also the ones who want their components weight in bright BOLD numbers and letters (while being weighed on the 3rd moon of Jupiter to shave an extra few grams....).
Roadie Rob is offline  
Old 08-02-05, 10:39 PM
  #3  
slider
Bike Junkie
 
Join Date: Nov 2003
Posts: 238
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Best to use a triple front derailleur. It handles the lower inner chainring better better than a standard double. I've got an Ultegra triple on both my cross and road which both run compact. I've seen the FSA, although, it doesn't look any better than the Ultegra triple.

-s
slider is offline  
Old 08-02-05, 10:42 PM
  #4  
shimanopower
Senior Member
 
shimanopower's Avatar
 
Join Date: Jul 2005
Location: chicago
Posts: 822

Bikes: lemond zurch, felt f55 '05

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by slider
Best to use a triple front derailleur. It handles the lower inner chainring better better than a standard double. I've got an Ultegra triple on both my cross and road which both run compact. I've seen the FSA, although, it doesn't look any better than the Ultegra triple.

-s
::hopes thread doesn't turn in another triple vs. compact::
shimanopower is offline  
Old 08-02-05, 10:42 PM
  #5  
55/Rad
Former Hoarder
 
55/Rad's Avatar
 
Join Date: Jan 2004
Location: Portland & Yachats, OR
Posts: 11,735

Bikes: Seven Axiom, Felt Z1, Dave Moulton Fuso

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 14 Post(s)
Liked 6 Times in 6 Posts
Are you using a 9 speed front der with a 10 speed setup? It will work but the shifting is sloppy as the cage is wider to work with the 9 speed chain. I found that by switching to a 10 speed der, my compact shifted much better.

55/Rad
__________________
55/Rad is offline  
Old 08-03-05, 12:17 AM
  #6  
Patriot
Faith-Vigilance-Service
 
Patriot's Avatar
 
Join Date: Jul 2004
Location: Port Orchard, WA
Posts: 8,330

Bikes: Trinity, Paradisus, Centurion, Mongoose, Trek

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time in 1 Post
I use the standard Centaur 10s front der on my wifes bike with the FSA carbon compact 50/34. I found that the der required much more precise setting to prevent it from pushing the chain off when upshifting to the big ring. At first it would drop the chain on the outside everytime she shifted. After adjusting the set-screw several times, I managed to get it to work just right. Also dropping the chain on the dowshift was an issue initially as well. Overall it is more finicky to set up than a standard 53/39 chainring set, but will work just fine once it is tweeked out.
The design of the compact der is made to prevent this, and make t easier to set up, without being so finicky. Overall, I think they all work, but they do act a little differantly with differant sized rings.
__________________
President, OCP
--"Will you have some tea... at the theatre with me?"--
Patriot is offline  
Old 08-03-05, 12:44 AM
  #7  
gmason
Senior Member (Retired)
 
gmason's Avatar
 
Join Date: Sep 2001
Location: Great North Woods
Posts: 2,671

Bikes: Vittorio, Centaur triple; Casati Laser Piu, Chorus Triple.

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I am in the process of changing my 50/34 Deda compact from Chorus double to Chorus CT. I plan to post the results - probably a week or two.

I am doing this because I just can't eliminate some kind of chain/front der interference in many gear combos. It has been suggested that it is the chain hitting the top of the cage, but we shall see. Or not.
gmason is offline  
Old 08-03-05, 01:32 AM
  #8  
fogrider
Senior Member
 
Join Date: Sep 2003
Location: fogtown...san francisco
Posts: 2,276

Bikes: Ron Cooper, Time VXSR, rock lobster, rock lobster, serotta, ritchey, kestrel, paramount

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by gmason
I am in the process of changing my 50/34 Deda compact from Chorus double to Chorus CT. I plan to post the results - probably a week or two.

I am doing this because I just can't eliminate some kind of chain/front der interference in many gear combos. It has been suggested that it is the chain hitting the top of the cage, but we shall see. Or not.
I've been using a chorus double with a 50/34 and it has been shifting fine. ird also makes a compact front der... https://www.interlocracing.com/cdfrtder.html, but I really think a double will work fine. just lower it a bit and check the alignment.
fogrider is offline  
Old 08-03-05, 03:01 AM
  #9  
TNoodles
Senior Member
 
Join Date: Feb 2005
Location: Oakland, California
Posts: 150

Bikes: 1986 Trek road bike (steel, downtube shifters), Rockhopper mountain bike, Seven steel/Campy

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I had my LBS put an FSA 50/34 on my 1986 Trek with Shimano SIS downtube shifters. Did not change FD and it works just fine.
TNoodles is offline  
Old 08-03-05, 03:10 AM
  #10  
Chucklehead
Whateverthehell
 
Chucklehead's Avatar
 
Join Date: Dec 2004
Location: U.S.S.A.
Posts: 7,432

Bikes: '06 Blue Competition RC5AL w/ritchey pro fork, spinergy stealth PBO, etc.

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
i didn't even move my FD when i installed.
__________________
"When once you have tasted flight, you will forever walk the earth with your eyes turned skyward, for there you have been, and there you will always long to return." - Leonardo daVinci
Chucklehead is offline  
Old 08-03-05, 03:17 AM
  #11  
gmason
Senior Member (Retired)
 
gmason's Avatar
 
Join Date: Sep 2001
Location: Great North Woods
Posts: 2,671

Bikes: Vittorio, Centaur triple; Casati Laser Piu, Chorus Triple.

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by fogrider
I've been using a chorus double with a 50/34 and it has been shifting fine.
Mine shifts fine as well. It simply will not allow elimination of the chain rub.
gmason is offline  
Old 08-03-05, 05:05 AM
  #12  
martin_j001
Allez!!! Allez!!!
 
martin_j001's Avatar
 
Join Date: May 2004
Location: Atlanta, GA
Posts: 834

Bikes: Gunnar Roadie w/Dura Ace, Benotto w/105

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by dog hair
i didn't even move my FD when i installed.
Same here. Barely needed any adjustment, and its been working fine so far....
martin_j001 is offline  
Old 08-03-05, 05:41 AM
  #13  
Grasschopper
He drop me
 
Grasschopper's Avatar
 
Join Date: Jul 2004
Location: Central PA
Posts: 11,664

Bikes: '03 Marin Mill Valley, '02 Eddy Merckx Corsa 0.1, '12 Giant Defy Advance, '20 Giant Revolt 1, '20 Giant Defy Advanced Pro 1, some random 6KU fixie

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 138 Post(s)
Liked 12 Times in 9 Posts
I am using an Ultegra Triple FD with my Ritchey WCS. Just because I am anal I lowered the derailleur and it shifts fine. I had some chain dropping issues when going from big ring to small but it turned out the cage wasn't perfectly straight...works perfectly now.
__________________
The views expressed by this poster do not reflect the views of BikeForums.net.
Grasschopper is offline  
Old 08-03-05, 07:32 AM
  #14  
55/Rad
Former Hoarder
 
55/Rad's Avatar
 
Join Date: Jan 2004
Location: Portland & Yachats, OR
Posts: 11,735

Bikes: Seven Axiom, Felt Z1, Dave Moulton Fuso

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 14 Post(s)
Liked 6 Times in 6 Posts
Originally Posted by dog hair
i didn't even move my FD when i installed.
(in the voice of Sydney) "well, you should have"

Seriously - the gap between the der and the chainring is wider than is recommended - by a lot - but if it works for you, terrific. Is that an OCLV frame with a braze-on tab that won't allow the der to go any lower? If so, I have 2 ideas to help that.

55/Rad
__________________
55/Rad is offline  
Old 08-03-05, 07:42 AM
  #15  
cryogenic
Campy or bust :p
 
cryogenic's Avatar
 
Join Date: Oct 2004
Location: Knoxville, TN
Posts: 3,139

Bikes: Surly Karate Monkey commuter build

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I'm running a Centaur compact only because it was available when I bought the components to build with and it was the same price so I figured it certainly couldn't hurt. It was pretty quick and easy to setup, however I don't see too much difference between it and a standard double front derailleur. I don't see any reason why a compact FD is absolutely mandatory by any stretch of the imagination.
cryogenic is offline  
Old 08-03-05, 08:14 AM
  #16  
blandin
if x=byh then x+1=byn
 
blandin's Avatar
 
Join Date: Mar 2005
Location: Sacramento, CA
Posts: 3,442

Bikes: See signature

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I put a Ritchey WCS compact on my KHS Flite 2000 whcih has a braze on front derailleur tab that would not allow the FD to be lowered sufficiently. I bought the compact FD made by IRD and it works flawlessly. So I guess if your setup allows proper adjustment, stick with what you have. If not, try the IRD or FSA options.
__________________
'00 TiSports Titanium - DA 9 speed------ '01 KHS Flite 800 - DA/Utegra 9 speed mix
‘02
Ellsworth Flight - Ultegra 10 speed -.'03 Basso Coral - Ultegra 10 speed
'03 Specialized Allez Pro - DA 10 speed .'04 Scattante CFR Limited - DA 9 speed
'05 KHS Flite 2000 - Ultegra 9 speed -... '06 Flyte SRS-3 - DA 9 speed-------
'05 Serotta Fierte - Utegra 10 speed--..-'07 Pedal Force RS - SRAM Force
blandin is offline  
Old 08-03-05, 10:47 AM
  #17  
ggg300
Burnin' and Lootin'
 
ggg300's Avatar
 
Join Date: Dec 2004
Location: SoCA
Posts: 2,713
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
https://www.bikeforums.net/road-cycling/123238-compact-crank-overload.html
ggg300 is offline  
Old 08-03-05, 11:51 AM
  #18  
Chucklehead
Whateverthehell
 
Chucklehead's Avatar
 
Join Date: Dec 2004
Location: U.S.S.A.
Posts: 7,432

Bikes: '06 Blue Competition RC5AL w/ritchey pro fork, spinergy stealth PBO, etc.

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by 55/Rad
(in the voice of Sydney) "well, you should have"

Seriously - the gap between the der and the chainring is wider than is recommended - by a lot - but if it works for you, terrific. Is that an OCLV frame with a braze-on tab that won't allow the der to go any lower? If so, I have 2 ideas to help that.

55/Rad
yeah, figured i was supposed to have moved it, but when i got on a took a spin around the block, everything checked out just fine and has worked grat since. i'll do it anyway when i'm in the mood.

...are you accusing me of owning a trek?! bah! kidding...it's s kestrel 200sci. there's actually a whole 'nother inch that i can lower the DR on the bracket.
__________________
"When once you have tasted flight, you will forever walk the earth with your eyes turned skyward, for there you have been, and there you will always long to return." - Leonardo daVinci
Chucklehead 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 © 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.