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.

Reply
 
Thread Tools Search this Thread
Old 04-05-13, 01:44 PM   #1
Seanimal757
Newbie
Thread Starter
 
Join Date: Apr 2013
Bikes:
Posts: 1
Shifter and Deraileur problems

I have a quest vanquish and the rear deraileur isnt shifting properly.

it will go to the largest cog when its only shifter into 4th

it shifts from 7 to 6 fine, 6 to 5 fine, skips right to 3 then, skips to 1.

Ive tried putting a new shifter on but it didnt change anything, i cant shift past 4th

the derlaileur isnt bent nor is the hanger.

any help PLEASE? =)
Seanimal757 is offline   Reply With Quote
Old 04-05-13, 01:51 PM   #2
Continuity
Senior Member
 
Join Date: Mar 2013
Location: NW UK
Bikes: 1992 Marin Eldridge Grade, 2007 Kona PHD and 199? Trek 1000 (current build project)
Posts: 418
Did you try configuring it properly, or did you just put a new shifter on without first checking cable tension/H&L stops etc.?

Everything you need to perform an RD tune-up you can find here.
Continuity is offline   Reply With Quote
Old 04-05-13, 02:01 PM   #3
dddd
Ride, Wrench, Swap, Race
 
dddd's Avatar
 
Join Date: Jan 2010
Location: Northern California
Bikes: Cheltenham-Pederson racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
Posts: 5,069
I might add that I commonly find "adjusted" shifting systems where the shifter hits low gear with the chain still in the middle of the cog stack.

Some serious cable-tensioning MIGHT fix it.

Also, note that the exact routing/placement of the inner wire (cable) at the anchor bolt (pinch bolt) can affect the ACTUATION RATIO of the derailer, and thus must be exactly as intended (in the groove) for the indexing to move accurately in response to the shift lever's movement.

Also check for smooth movement of the cable. Tug on the exposed length of cable running alongside the frame tube. The cable should move and recover it's tension as you let go of it. The action should be smooth and friction-free.
dddd is offline   Reply With Quote
Old 04-05-13, 02:10 PM   #4
gyozadude
Senior Member
 
gyozadude's Avatar
 
Join Date: Jun 2011
Location: Sunnyvale, California
Bikes: Bridgestone RB-1, 600, T700, MB-6 w/ Dirt Drops, MB-Zip, Bianchi Limited, Nashbar Hounder
Posts: 1,180
Always start with cable unattached, tension adjuster barrel screwed all the way in and then back out 1/2 to 1 turn at the most and the shifter in high gear. Turn the crank and make sure the chain is on the small cog. Now attach the cable and with finger tension on the cable, tighten the cable pinch bolt on the RD. Shift one click on the shifter, and then adjust the tension barrel out until the chain shifts to the 2nd smallest cog. Now test and shift through all the gears. And when the shifting works, shift back to the smallest cog (highest gear) and make adjustments to the stop screw if necessary. Repeat this stop screw adjustment after shifting to the lowest gear (biggest cog).
gyozadude is offline   Reply With Quote
Old 04-05-13, 03:24 PM   #5
cny-bikeman 
Mechanic/Tourist
 
Join Date: Apr 2007
Location: Syracuse, NY
Bikes: 2008 Novara Randonee - love it. Would have more bikes if I had time to ride them all. Previous bikes: 1968 Motobecane Mirage, 1972 Moto Grand Jubilee (my fav), Jackson Rake 16, 1983 C'dale ST500.
Posts: 6,166
Quote:
Originally Posted by gyozadude View Post
Always start with cable unattached, tension adjuster barrel screwed all the way in.... Repeat this stop screw adjustment after shifting to the lowest gear (biggest cog).
The above is good advice. If you are still having problems you can also Google adjust rear derailleur - Sheldonbrown and Parktool results are generally the best, but you can check videos for additional information. Go through the entire procedure and also make sure cables are running smoothly.

Please either take more time initially or use Edit Post to correct spelling, typos, capitalization, etc. We put much effort into crafting a clear answer, and it helps us in doing so if your question is clear and not difficult to read.

Thank you.
__________________
There's no such thing as a routine repair.

Don't tell me what "should" be - either it is, it isn't, or do something about it.

If you think I'm being blunt take it as a compliment - if I thought you were too weak to handle the truth or a strong opinion I would not bother.

Please take the time to post clearly so we can answer quickly. All lowercase and multiple typos makes for a hard read. Thanks!
cny-bikeman is offline   Reply With Quote
Reply


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 08:00 PM.