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

Reply
 
Thread Tools Search this Thread
Old 09-19-06, 09:37 AM   #1
BobSter
Newbie
Thread Starter
 
Join Date: Sep 2006
Bikes:
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Deraileur knocking frame

Hi,

I've just bought a Giant Terrago and noticed that if I ran over a bump the rear deraileur knocks up onto the frame. I asked the guy in the bike shop if it needed adjusting but he has simply stuck on a rubber buffer to stop it chipping the paintwork.

I assume that this can't just be a design flaw. Is there any other adjustment that I can do or suggest the shop does. Can they tighten the spring of the deraileur - does this have any drawbacks ?

thanks for any help

Rob
BobSter is offline   Reply With Quote
Old 09-19-06, 06:38 PM   #2
toolboy
Senior Member
 
toolboy's Avatar
 
Join Date: Mar 2006
Location: Regina, Saskatchewan, Canada
Bikes: Steve Bauer Whirlwind, Nishiki International, Rocky Mountain Element 30 1984 Cinelli Super Corsa w/Campy 50th, Surly LHT.
Posts: 312
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Is it the derailleur hitting the frame or is it just chain slap - the chain hitting the stay? This rubber "bumper" - did the mechanic apply it to the stay?
toolboy is offline   Reply With Quote
Old 09-20-06, 09:11 AM   #3
BobSter
Newbie
Thread Starter
 
Join Date: Sep 2006
Bikes:
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
It is the deraileur knocking the frame, the rubber cushion is cable tied onto the deraileur body - I've hopefully attached a picky
Attached Images
File Type: jpg Photo-0113.jpg (84.0 KB, 38 views)
BobSter is offline   Reply With Quote
Old 09-20-06, 09:55 AM   #4
erader
Senior Member
 
erader's Avatar
 
Join Date: Feb 2006
Location: silicon valley
Bikes:
Posts: 1,774
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by BobSter
It is the deraileur knocking the frame, the rubber cushion is cable tied onto the deraileur body - I've hopefully attached a picky

looks like a design related issue. i wonder if adjusting the tension screw would help?

ed rader
erader is offline   Reply With Quote
Old 09-20-06, 09:59 AM   #5
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 29,112
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 175 Post(s)
I believe your chain is too long. Try shifting into the "big-big" combination as see if there is still a lot of derailleur travel left. If so, shortening the chain until it will just allow big-big should solve the problem.
HillRider is offline   Reply With Quote
Old 09-20-06, 01:39 PM   #6
Talon
Senior Member
 
Join Date: Sep 2006
Location: S.F. Bay Area
Bikes: Scott CR1 SL, Giant TCR-C0, Fisher Sugar, old Cannondale, Lemond Tourmalet
Posts: 56
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You're not the only one whose rear mech hits the stay on rough terrain. This is the exact reason shimano uses a rubber bumper on their XT rear derailleur. Some of the locals here like to cut out a piece of old tire and zip-tie it to the frame. I have some old road bike bar tape wrapped around the stay and secured with a few layers of electrical tape. I like a quiet bike.
Talon is offline   Reply With Quote
Old 09-21-06, 09:00 AM   #7
BobSter
Newbie
Thread Starter
 
Join Date: Sep 2006
Bikes:
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
thanks for the replies.

I'll mention some of your solutions when I go back to the shop at the weekend. Meanwhile I think I will also tie a piece of rubber to my stay!
I'll let you know how I get on.
BobSter is offline   Reply With Quote
Old 09-21-06, 06:26 PM   #8
ultraman6970
Senior Member
 
Join Date: Dec 2005
Bikes:
Posts: 7,860
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
get a decent bike next time
ultraman6970 is offline   Reply With Quote
Old 10-02-06, 02:15 AM   #9
BobSter
Newbie
Thread Starter
 
Join Date: Sep 2006
Bikes:
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The shop said that the chain shouldn't be tensioned too much (extra wear ?) and looking at some of the other (mainly Giant) bikes in the shop seem to have the same issue.

Anyway the shop has been helpfull and fitted some better cross country gears so I'm happy for the moment. Perhaps after this bike has died I'll get a decent one.
BobSter 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 01:15 PM.