Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  

Go Back   > >

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.

User Tag List

Thread Tools Search this Thread
Old 11-18-10, 06:03 AM   #1
Senior Member
Thread Starter
Join Date: Jul 2010
Location: Knoxville, TN
Bikes: Motobecane
Posts: 124
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Gear slipping

I'm somewhat new to this so forgive me if I use the incorrect lingo.

I have a Specialized Allez with two "chain rings" up front and a rear cassette with 7 or so gears. I've noticed some slipping between the 3rd and 5th gears. I'll get a clicking sound and, at times, the gear will shift on its own.

I'm assuming this is a rear derailleur issue. Is this something that can be fixed via an adjustment or is this something that would require a replacement of the derailler?

Thanks in advance.
knoxtnhorn is offline   Reply With Quote
Old 11-18-10, 07:51 AM   #2
Senior Member
Join Date: Mar 2007
Location: Louisville, KY
Bikes: Trek Madone 5.5, Klein Q Pro Elite, Surley LHT
Posts: 469
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
From your description it sounds like a simple gear adjustment.
kycycler is offline   Reply With Quote
Old 11-18-10, 09:57 AM   #3
Senior Member
Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Posts: 35,306
Mentioned: 105 Post(s)
Tagged: 1 Thread(s)
Quoted: 3650 Post(s)
It sounds like an adjustment, most likely of the threaded fitting where the housing ends on the RD. Turning this in either direction effectively lengthens or shortens the cable fine tuning the position - trim - of the derailleur in each gear (lever click).

Hang the bike with the rear wheel off the ground and turn the adjuster one full turn outward. That should make the RD shift to larger sprockets more effectively and to smaller ones more sluggishly. If you turn it inward the opposite happens. Your goal is to find the adjustment with the best balance between up and down shifting, which should solve your problem.

There are other possibilities including chain/cassette wear, cable friction, mis-aligned hanger or a problem in the lever whereby it doesn't stay clicked in position properly. Start with the basic adjustment, and if that doesn't solve your problem you can move on from there. There are a number of good guides on derailleur adjustment available on the internet including some videos which you'll find to be very helpful.
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline   Reply With Quote
Old 11-20-10, 01:42 AM   #4
Senior Member
Join Date: Oct 2006
Location: Mission Hills, CA (LA)
Posts: 160
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
First thing I would do is lubricate the derailleur and the shift cable within it's housing. The derailleur is probably being restricted by friction somewhere in the system. When the friction gives way, it shifts. Had a similar problem recently and a few drops of oil did the trick.
Sprint75 is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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

All times are GMT -6. The time now is 01:17 PM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.
  • Ask a Question
    get answers from real people!
Click to start entering your question.