Go Back  Bike Forums > Bike Forums > Classic & Vintage
Reload this Page >

Front derailleur cage wear with half-step gearing

Notices
Classic & Vintage This forum is to discuss the many aspects of classic and vintage bicycles, including musclebikes, lightweights, middleweights, hi-wheelers, bone-shakers, safety bikes and much more.

Front derailleur cage wear with half-step gearing

Old 04-02-22, 09:03 PM
  #1  
sysrq
Senior Member
Thread Starter
 
Join Date: Mar 2019
Posts: 198
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 104 Post(s)
Liked 4 Times in 4 Posts
Front derailleur cage wear with half-step gearing

How do people normally tackle the front derailleur cage wear as a result of frequent use associated with half-step gearing? Nobody seems to mention it on the forums.
sysrq is offline  
Old 04-02-22, 09:57 PM
  #2  
old's'cool
curmudgineer
 
old's'cool's Avatar
 
Join Date: Dec 2009
Location: Chicago SW burbs
Posts: 4,419

Bikes: 2 many 2 fit here

Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 259 Post(s)
Liked 103 Times in 63 Posts
Well, all my bikes have half-step gearing, but the majority of my shifts are full step. The half-step normally only comes into play when I get into the upper cruising range (above ~90"). Other than that, if I have a long cruise in the mid-range, and I need a half step to optimize my cadence, I use it... but most of the time, the cruise distance (before direction, meaning wind change, or slope change) is not long enough to warrant a half-step shift. To be sure, my full steps are in the 12-15% range, half steps half of that obviously.
old's'cool is offline  
Likes For old's'cool:
Old 04-02-22, 11:33 PM
  #3  
Bad Lag
Senior Member
 
Join Date: Jul 2013
Location: So Cal, for now
Posts: 1,680

Bikes: 1975 Bob Jackson - Nuovo Record, Brooks Pro, Clips & Straps

Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 666 Post(s)
Liked 270 Times in 168 Posts
What kind of wear are you seeing that it is a concern?

Finesse it. It is not a power shift.
Bad Lag is offline  
Likes For Bad Lag:
Old 04-03-22, 07:24 AM
  #4  
JohnDThompson 
Old fart
 
JohnDThompson's Avatar
 
Join Date: Nov 2004
Location: Appleton WI
Posts: 23,632

Bikes: Several, mostly not name brands.

Mentioned: 141 Post(s)
Tagged: 0 Thread(s)
Quoted: 2999 Post(s)
Liked 2,095 Times in 1,246 Posts
Originally Posted by sysrq View Post
How do people normally tackle the front derailleur cage wear as a result of frequent use associated with half-step gearing? Nobody seems to mention it on the forums.
I've been using half-step gearing for decades and never had a problem with front derailleur wear. Are you perhaps using indexed shifting where you can't properly trim the front derailleur to stop chain rub?
JohnDThompson is offline  
Old 04-03-22, 08:52 AM
  #5  
sysrq
Senior Member
Thread Starter
 
Join Date: Mar 2019
Posts: 198
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 104 Post(s)
Liked 4 Times in 4 Posts
Originally Posted by JohnDThompson View Post
I've been using half-step gearing for decades and never had a problem with front derailleur wear. Are you perhaps using indexed shifting where you can't properly trim the front derailleur to stop chain rub?
It's an index shifter but there is no chain rub.
sysrq is offline  
Old 04-03-22, 08:57 AM
  #6  
sysrq
Senior Member
Thread Starter
 
Join Date: Mar 2019
Posts: 198
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 104 Post(s)
Liked 4 Times in 4 Posts
Originally Posted by old's'cool View Post
Well, all my bikes have half-step gearing, but the majority of my shifts are full step. The half-step normally only comes into play when I get into the upper cruising range (above ~90"). Other than that, if I have a long cruise in the mid-range, and I need a half step to optimize my cadence, I use it... but most of the time, the cruise distance (before direction, meaning wind change, or slope change) is not long enough to warrant a half-step shift. To be sure, my full steps are in the 12-15% range, half steps half of that obviously.
Well I'm constantly searching for optimal gear, only use full step when there is obvious incline.
sysrq is offline  
Old 04-03-22, 09:21 AM
  #7  
oneclick 
Senior Member
 
Join Date: Feb 2020
Posts: 1,966
Mentioned: 32 Post(s)
Tagged: 0 Thread(s)
Quoted: 735 Post(s)
Likes: 0
Liked 771 Times in 468 Posts
Originally Posted by sysrq View Post
It's an index shifter but there is no chain rub.
If the chain isn't causing the wear, what is? Just the shifts?

If so, there are a number of Huret front mechs with a spring-loaded inner cage plate, you could try one of those.
oneclick is offline  
Old 04-03-22, 12:00 PM
  #8  
JohnDThompson 
Old fart
 
JohnDThompson's Avatar
 
Join Date: Nov 2004
Location: Appleton WI
Posts: 23,632

Bikes: Several, mostly not name brands.

Mentioned: 141 Post(s)
Tagged: 0 Thread(s)
Quoted: 2999 Post(s)
Liked 2,095 Times in 1,246 Posts
Originally Posted by sysrq View Post
It's an index shifter but there is no chain rub.
If there's no chain rub, what is causing the front derailleur wear?
JohnDThompson is offline  
Old 04-03-22, 12:17 PM
  #9  
Bad Lag
Senior Member
 
Join Date: Jul 2013
Location: So Cal, for now
Posts: 1,680

Bikes: 1975 Bob Jackson - Nuovo Record, Brooks Pro, Clips & Straps

Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 666 Post(s)
Liked 270 Times in 168 Posts
Almost certainly, the OP is shifting "hard", that is, fast. The faster you shift, the more force imparted. The more force, the more wear.

Even with an indexed shifter, finesse the shift, be gentle. Shifting is not a speed or strength contest, especially up front, especially an up-shift.

Ok, I'll shut up now.

Last edited by Bad Lag; 04-03-22 at 02:06 PM.
Bad Lag is offline  
Likes For Bad Lag:
Old 04-04-22, 11:27 AM
  #10  
sysrq
Senior Member
Thread Starter
 
Join Date: Mar 2019
Posts: 198
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 104 Post(s)
Liked 4 Times in 4 Posts
Originally Posted by Bad Lag View Post
Almost certainly, the OP is shifting "hard", that is, fast. The faster you shift, the more force imparted. The more force, the more wear.

Even with an indexed shifter, finesse the shift, be gentle. Shifting is not a speed or strength contest, especially up front, especially an up-shift.

Ok, I'll shut up now.
Not sure if the shifting is too forced or is it just a normal shifting without too much babying.
sysrq is offline  
Old 04-05-22, 12:22 PM
  #11  
Fredo76
The Wheezing Geezer
 
Fredo76's Avatar
 
Join Date: Oct 2021
Location: Española, NM
Posts: 339

Bikes: 1976 Fredo Speciale, Jamis Citizen 1, Ellis-Briggs FAVORI, Rivendell Clem Smith Jr.

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 151 Post(s)
Liked 255 Times in 130 Posts
I have never thought of a front derailleur cage as a consumable part. Unless yours is made from a soft alloy, I wouldn't worry about it.
Fredo76 is offline  
Likes For Fredo76:
Old 04-05-22, 02:32 PM
  #12  
The Golden Boy 
Extraordinary Magnitude
 
The Golden Boy's Avatar
 
Join Date: Aug 2009
Location: Waukesha WI
Posts: 13,088

Bikes: 1978 Trek TX700; 1978/79 Trek 736; 1984 Specialized Stumpjumper Sport; 1984 Schwinn Voyageur SP; 1985 Trek 620; 1985 Trek 720; 1986 Trek 400 Elance; 1987 Schwinn High Sierra; 1990 Miyata 1000LT

Mentioned: 80 Post(s)
Tagged: 0 Thread(s)
Quoted: 2391 Post(s)
Liked 1,069 Times in 633 Posts
Originally Posted by Fredo76 View Post
I have never thought of a front derailleur cage as a consumable part. Unless yours is made from a soft alloy, I wouldn't worry about it.
I can't seem to find that picture of the completely worn through cage... like let the chain grind on the derailleur until it wore completely through....
__________________
*Recipient of the 2006 Time Magazine "Person Of The Year" Award*

Commence to jigglin’ huh?!?!

"But hey, always love to hear from opinionated amateurs." -says some guy to Mr. Marshall.
The Golden Boy is offline  
Old 04-05-22, 02:37 PM
  #13  
52telecaster
ambulatory senior
 
52telecaster's Avatar
 
Join Date: Dec 2016
Location: Peoria Il
Posts: 4,663

Bikes: Bob Jackson World Tour, Falcon and lots of other bikes.

Mentioned: 60 Post(s)
Tagged: 0 Thread(s)
Quoted: 1407 Post(s)
Liked 1,487 Times in 761 Posts
Originally Posted by The Golden Boy View Post
I can't seem to find that picture of the completely worn through cage... like let the chain grind on the derailleur until it wore completely through....
My gf did one in. It was worn when I put it on her bike and she is not a fan of trimming the front mech.
52telecaster is offline  
Old 04-05-22, 04:27 PM
  #14  
oneclick 
Senior Member
 
Join Date: Feb 2020
Posts: 1,966
Mentioned: 32 Post(s)
Tagged: 0 Thread(s)
Quoted: 735 Post(s)
Likes: 0
Liked 771 Times in 468 Posts
Originally Posted by The Golden Boy View Post
I can't seem to find that picture of the completely worn through cage... like let the chain grind on the derailleur until it wore completely through....
I had a Valentino cage wear through completely on the outer plate, on a 2x7-speed rig. It was on a trip, borrowed a blowlamp and a bit of brass wire and brazed a dime on the outside to fix it, was good for several more tours.
oneclick is offline  
Old 04-05-22, 06:36 PM
  #15  
old's'cool
curmudgineer
 
old's'cool's Avatar
 
Join Date: Dec 2009
Location: Chicago SW burbs
Posts: 4,419

Bikes: 2 many 2 fit here

Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 259 Post(s)
Liked 103 Times in 63 Posts
Expensive repair
old's'cool 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.