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

front derailer, inner limit screw

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.

front derailer, inner limit screw

Old 06-06-19, 02:32 PM
  #1  
rumrunn6
Senior Member
Thread Starter
 
rumrunn6's Avatar
 
Join Date: Jul 2008
Location: 25 miles northwest of Boston
Posts: 22,903

Bikes: Bottecchia Sprint, GT Timberline 29r

Mentioned: 87 Post(s)
Tagged: 0 Thread(s)
Quoted: 3026 Post(s)
Liked 100 Times in 87 Posts
front derailer, inner limit screw

if I just want to adjust the front derailer inner limit screw so that the derailer moves a mm or two away from the frame, meaning outward, to the right

does anyone know, off the top of your head:

1- which way do I turn the screw?
2- do I need to have the chain in any special place, meaning like on the small front chainring? & or the big rear chainring?
rumrunn6 is offline  
Old 06-06-19, 03:01 PM
  #2  
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 41,928

Bikes: 8

Mentioned: 188 Post(s)
Tagged: 0 Thread(s)
Quoted: 6833 Post(s)
Likes: 0
Liked 213 Times in 178 Posts
only rarely are machine screw threads left handed so ... tighty righty , clockwise..
fietsbob is offline  
Old 06-06-19, 03:36 PM
  #3  
Bill Kapaun
Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Posts: 10,803

Bikes: 86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.

Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 661 Post(s)
Liked 26 Times in 22 Posts
I'd suggest holding the FDER over with one hand to relieve tension on the screw. It saves threads in the FDER body.
It's relatively soft aluminum & steel threads tend to wear it badly when screwed under tension.
It's a limit screw, not a jacking screw.
Bill Kapaun is offline  
Likes For Bill Kapaun:
Old 06-06-19, 06:42 PM
  #4  
dsbrantjr
Senior Member
 
dsbrantjr's Avatar
 
Join Date: Sep 2010
Location: Roswell, GA
Posts: 6,227

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

Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 650 Post(s)
Likes: 0
Liked 44 Times in 41 Posts
Put the chain in big rear, small front, closest inboard. Adjust the screw, following Bill Kapaun's suggestion, until there is 1mm max clearance from the chain at its nearest point in the crank's revolution. You will normally not need to move it again.
dsbrantjr is offline  
Likes For dsbrantjr:
Old 06-06-19, 07:02 PM
  #5  
rumrunn6
Senior Member
Thread Starter
 
rumrunn6's Avatar
 
Join Date: Jul 2008
Location: 25 miles northwest of Boston
Posts: 22,903

Bikes: Bottecchia Sprint, GT Timberline 29r

Mentioned: 87 Post(s)
Tagged: 0 Thread(s)
Quoted: 3026 Post(s)
Liked 100 Times in 87 Posts
I brought it up due to derailer rubbing tire occasionally under load

narrated my answer into my phone w/ a screw driver on the correct screw: on this bike, it's he outside screw the one marked low clockwise moves it out away from the bike counter clockwise moves it left toward the frame




Last edited by rumrunn6; 06-07-19 at 07:37 AM.
rumrunn6 is offline  
Old 06-06-19, 07:16 PM
  #6  
Bill Kapaun
Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Posts: 10,803

Bikes: 86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.

Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 661 Post(s)
Liked 26 Times in 22 Posts
Nice, dry chain.
Only slight rust.
Grind, grind.
Bill Kapaun is offline  
Old 06-06-19, 07:19 PM
  #7  
rumrunn6
Senior Member
Thread Starter
 
rumrunn6's Avatar
 
Join Date: Jul 2008
Location: 25 miles northwest of Boston
Posts: 22,903

Bikes: Bottecchia Sprint, GT Timberline 29r

Mentioned: 87 Post(s)
Tagged: 0 Thread(s)
Quoted: 3026 Post(s)
Liked 100 Times in 87 Posts
Ignore the chain location in that photo cuz it’s on the small sprocket in the back. Or I tugged in the chain to see the other part So I adjusted the screw & deflated & massaged the tire so it wobbles less seems better . Took it out in the parking lot for testing before it got dark, including a climb, under load, in lowest gears front & rear no rubbing. Isn’t a lot of room tho & if the skewer loosens the wheel can rotate it into the derailer which has happened cpl times so I’m keeping an eye on that skewer tension too

Last edited by rumrunn6; 06-07-19 at 04:15 AM.
rumrunn6 is offline  
Old 06-06-19, 07:22 PM
  #8  
rumrunn6
Senior Member
Thread Starter
 
rumrunn6's Avatar
 
Join Date: Jul 2008
Location: 25 miles northwest of Boston
Posts: 22,903

Bikes: Bottecchia Sprint, GT Timberline 29r

Mentioned: 87 Post(s)
Tagged: 0 Thread(s)
Quoted: 3026 Post(s)
Liked 100 Times in 87 Posts
Thanks guys sensible tips
rumrunn6 is offline  
Old 06-06-19, 07:25 PM
  #9  
rumrunn6
Senior Member
Thread Starter
 
rumrunn6's Avatar
 
Join Date: Jul 2008
Location: 25 miles northwest of Boston
Posts: 22,903

Bikes: Bottecchia Sprint, GT Timberline 29r

Mentioned: 87 Post(s)
Tagged: 0 Thread(s)
Quoted: 3026 Post(s)
Liked 100 Times in 87 Posts
Originally Posted by Bill Kapaun View Post
Nice, dry chain.Only slight rust.Grind, grind.
I had a real mud fest last time out so I washed everything & let it dry. I just lubed it up before the test ride

Last edited by rumrunn6; 06-07-19 at 07:38 AM.
rumrunn6 is offline  
Old 06-06-19, 11:28 PM
  #10  
JoeTBM 
Droid on a mission
 
JoeTBM's Avatar
 
Join Date: May 2018
Location: Palm Coast, FL
Posts: 236

Bikes: Diamondback Wildwood Classic

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 55 Post(s)
Liked 4 Times in 4 Posts
Originally Posted by rumrunn6 View Post
I had a real mud fest last time out so I washed it and let it dry. I just lubed it up before the test ride

I'd wipe that chain down real good and re-lube, if you still have that amount of rust oozing from the rollers then repeat again.
__________________
JoeTBM (The Bike Man)
I'm a black & white type of guy, the only gray in my life is the hair on my head.
JoeTBM is offline  
Old 06-07-19, 03:57 AM
  #11  
rumrunn6
Senior Member
Thread Starter
 
rumrunn6's Avatar
 
Join Date: Jul 2008
Location: 25 miles northwest of Boston
Posts: 22,903

Bikes: Bottecchia Sprint, GT Timberline 29r

Mentioned: 87 Post(s)
Tagged: 0 Thread(s)
Quoted: 3026 Post(s)
Liked 100 Times in 87 Posts
sorry about those large pics. was working with just my phone. that's a really difficult area to photo. took another look this am. chain on both inner rings front & rear & w/o touching chain rotated tire to closest pass. doesn't wobble as much so I'm glad about that & this clearance I think is usable. also used a rotary grindstone on my drill to trim back a mm off the black part that was like folded over & protruding toward the tire (even tho this isn't where the actual rubbing was happening, it was rubbing on the silver part)


Last edited by rumrunn6; 06-07-19 at 07:41 AM.
rumrunn6 is offline  
Old 06-07-19, 03:58 AM
  #12  
rumrunn6
Senior Member
Thread Starter
 
rumrunn6's Avatar
 
Join Date: Jul 2008
Location: 25 miles northwest of Boston
Posts: 22,903

Bikes: Bottecchia Sprint, GT Timberline 29r

Mentioned: 87 Post(s)
Tagged: 0 Thread(s)
Quoted: 3026 Post(s)
Liked 100 Times in 87 Posts
Originally Posted by JoeTBM View Post
I'd wipe that chain down real good and re-lube, if you still have that amount of rust oozing from the rollers then repeat again.
ran out last night. gotta buy another bottle
rumrunn6 is offline  
Old 06-07-19, 08:23 AM
  #13  
Retro Grouch 
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Posts: 29,298

Bikes: Catrike 559 I own some others but they don't get ridden very much.

Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
Quoted: 1159 Post(s)
Liked 31 Times in 23 Posts
Think before you screw.

1. Was it ever right? Derailleur limit screws, once set correctly, seldom need readjustment.
2. If it only happens when under load, the grinding you hear is probably due to bottom bracket movement.
__________________
My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.
Retro Grouch is offline  
Old 06-07-19, 08:53 AM
  #14  
djb
Senior Member
 
Join Date: Jul 2010
Location: Montreal Canada
Posts: 8,877
Mentioned: 23 Post(s)
Tagged: 0 Thread(s)
Quoted: 1087 Post(s)
Likes: 0
Liked 38 Times in 30 Posts
Originally Posted by JoeTBM View Post
I'd wipe that chain down real good and re-lube, if you still have that amount of rust oozing from the rollers then repeat again.
old rag, put some elbow grease into the wiping. relube as said, and repeat until rust goes away, even if it never sleeps.

like horses, dont put chains away wet and unlubed.

before anyone asks, my fav horse lube is "TriggerLube", regularly get 5000kms out of a set of shoes.
djb is offline  
Old 06-07-19, 08:56 AM
  #15  
rumrunn6
Senior Member
Thread Starter
 
rumrunn6's Avatar
 
Join Date: Jul 2008
Location: 25 miles northwest of Boston
Posts: 22,903

Bikes: Bottecchia Sprint, GT Timberline 29r

Mentioned: 87 Post(s)
Tagged: 0 Thread(s)
Quoted: 3026 Post(s)
Liked 100 Times in 87 Posts
Originally Posted by Retro Grouch View Post
Think before you screw.

1. Was it ever right? Derailleur limit screws, once set correctly, seldom need readjustment.
2. If it only happens when under load, the grinding you hear is probably due to bottom bracket movement.
hmmm, trying to remember. bought the bike used. my riding has gotten progressively more aggressive on steeper terrain. like I mentioned the left rear dropout wiggled out causing the wheel to pivot right & jam. dunno if that best the derailer a smidge. making it more susceptible to rubbing again. every time I mount those tires I have to massage them a lot to get them on w/o too much wobble. since I bought the bike I never adjusted the limit screws. is a little bottom bracket movement OK or should I be looking for other symptoms for replacing it?
rumrunn6 is offline  
Old 06-07-19, 09:16 AM
  #16  
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 41,928

Bikes: 8

Mentioned: 188 Post(s)
Tagged: 0 Thread(s)
Quoted: 6833 Post(s)
Likes: 0
Liked 213 Times in 178 Posts
catching up.... I'm seeing the typical issue..

A trade off of fat knobby tire, + short chainstay bikes, grind off offending knob rubber ...

or just put a tire on without that interference..








..
fietsbob is offline  
Likes For fietsbob:
Old 06-07-19, 09:23 AM
  #17  
rumrunn6
Senior Member
Thread Starter
 
rumrunn6's Avatar
 
Join Date: Jul 2008
Location: 25 miles northwest of Boston
Posts: 22,903

Bikes: Bottecchia Sprint, GT Timberline 29r

Mentioned: 87 Post(s)
Tagged: 0 Thread(s)
Quoted: 3026 Post(s)
Liked 100 Times in 87 Posts
Originally Posted by fietsbob View Post
the typical issue..A trade off of fat knobby tire, + short chainstay bikes, grind off offending knob rubber ...
hehe that thought occurred to me too! wondering if a sharp utility knife might work better than a rotary tool for that. or maybe one of these



Last edited by rumrunn6; 06-07-19 at 09:42 AM.
rumrunn6 is offline  
Old 06-07-19, 09:43 AM
  #18  
trailangel
Senior Member
 
trailangel's Avatar
 
Join Date: Feb 2014
Location: Pasadena, CA
Posts: 3,628

Bikes: Schwinn Varsity

Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 1260 Post(s)
Liked 45 Times in 31 Posts
"Think before you screw" ... that's funny.
BikerBob had a good idea.... cut the tire down..... I like that idea.
Also...in cases like this where you just need a bit more clearance... I use an adjustable Crescent wrench and pliers and tweak the front DR in the right place.
trailangel is offline  
Old 06-07-19, 09:55 AM
  #19  
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 41,928

Bikes: 8

Mentioned: 188 Post(s)
Tagged: 0 Thread(s)
Quoted: 6833 Post(s)
Likes: 0
Liked 213 Times in 178 Posts
maybe one of those reciprocating 2 blade motorized carving knives?

... that only get used for the big holiday birds.. charity shop search should find some







...
fietsbob is offline  
Likes For fietsbob:
Old 06-07-19, 11:49 AM
  #20  
Bill Kapaun
Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Posts: 10,803

Bikes: 86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.

Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 661 Post(s)
Liked 26 Times in 22 Posts
I'd probably use my 3" cut off wheel....outside.

Like this-
https://www.harborfreight.com/3-in-H...ool-63023.html
Bill Kapaun is offline  
Old 06-07-19, 12:07 PM
  #21  
rumrunn6
Senior Member
Thread Starter
 
rumrunn6's Avatar
 
Join Date: Jul 2008
Location: 25 miles northwest of Boston
Posts: 22,903

Bikes: Bottecchia Sprint, GT Timberline 29r

Mentioned: 87 Post(s)
Tagged: 0 Thread(s)
Quoted: 3026 Post(s)
Liked 100 Times in 87 Posts
Originally Posted by trailangel View Post
Also...in cases like this where you just need a bit more clearance... I use an adjustable Crescent wrench and pliers and tweak the front DR in the right place.
I tried but the thing just flexes, doesn't bend & not sure I want to take two tools to it
rumrunn6 is offline  
Old 06-07-19, 12:51 PM
  #22  
trailangel
Senior Member
 
trailangel's Avatar
 
Join Date: Feb 2014
Location: Pasadena, CA
Posts: 3,628

Bikes: Schwinn Varsity

Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 1260 Post(s)
Liked 45 Times in 31 Posts
Originally Posted by rumrunn6 View Post
I tried but the thing just flexes, doesn't bend & not sure I want to take two tools to it
It's a cheap DR. How can you ruin it? You need to use the Cresent wrench and the pliers at the same time........
trailangel is offline  
Likes For trailangel:
Old 07-08-19, 12:46 PM
  #23  
rumrunn6
Senior Member
Thread Starter
 
rumrunn6's Avatar
 
Join Date: Jul 2008
Location: 25 miles northwest of Boston
Posts: 22,903

Bikes: Bottecchia Sprint, GT Timberline 29r

Mentioned: 87 Post(s)
Tagged: 0 Thread(s)
Quoted: 3026 Post(s)
Liked 100 Times in 87 Posts
finally got back out on this bike. no more rubbing
rumrunn6 is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
tjk23
Road Cycling
6
05-16-13 12:26 PM
YamiRider1316
Mountain Biking
13
03-30-13 06:48 AM
Mike_Hunt
BMX
0
06-21-10 07:31 PM
RCBrust
Northeast
22
09-19-08 05:47 AM
tzracer
Great Lakes
0
03-02-08 11:08 AM

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.