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 10-23-08, 01:32 AM   #1
arexjay
Senior Member
Thread Starter
 
Join Date: Jul 2008
Bikes:
Posts: 561
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Front derailleur clamp too big!

I just bought a SRAM Rival front derailleur, stupidly assuming that the 31.8 clamp would fit my seat tube. It's too big. Is there any kind of shim I can put in there? Or do I just need to buy a new front derailleur?
arexjay is offline   Reply With Quote
Old 10-23-08, 01:38 AM   #2
arexjay
Senior Member
Thread Starter
 
Join Date: Jul 2008
Bikes:
Posts: 561
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Just found a shim on Universal Cycles. I guess that answers my question.
arexjay is offline   Reply With Quote
Old 10-23-08, 04:57 AM   #3
Panthers007
Great State of Varmint
 
Panthers007's Avatar
 
Join Date: Sep 2008
Location: Dante's Third Ring
Bikes:
Posts: 7,479
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I just got a Shimano XTR in 34.9mm for my bike. It came with adapters to allow it to fit both the 28.6mm and the 31.8mm. So the objects do exist. Maybe ask your LBS if they have some of these. They might give you one.
Panthers007 is offline   Reply With Quote
Old 10-23-08, 06:00 AM   #4
Hobartlemagne 
Spelling Snob
 
Hobartlemagne's Avatar
 
Join Date: Dec 2005
Location: Plano, Texas
Bikes: Panasonic DX4000, Bianchi Pista
Posts: 2,862
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The FD is one of the cheapest components. Consider buying the correct size.
__________________

The first rule of flats is You don't talk about flats!
Hobartlemagne is offline   Reply With Quote
Old 10-23-08, 08:49 AM   #5
mcgreivey
STFD
 
mcgreivey's Avatar
 
Join Date: Jul 2008
Location: North Bergen, NJ
Bikes: '80 Windsor Carrera Sport, '02 Specialized Sirrus A1, '10 Giant Escape 2
Posts: 778
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Just cut up some old inner tube and wrap it 'round and 'round until it's the right diameter. Not.
mcgreivey is offline   Reply With Quote
Old 10-23-08, 10:23 AM   #6
steveknight
Senior Member
 
Join Date: Mar 2004
Location: portland or
Bikes:
Posts: 1,888
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
go get some metal shim stock. should be able to get it locally.
steveknight is offline   Reply With Quote
Old 10-23-08, 12:20 PM   #7
Mondoman
Senior Member
 
Join Date: Apr 2008
Location: A Latvian in Seattle
Bikes:
Posts: 1,020
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I like P7's suggestion. Seems like all the FD's I've bought have come with an adapter or two, which I just toss in my probably-never-use box.
Mondoman is offline   Reply With Quote
Old 10-23-08, 10:07 PM   #8
Jeff Wills
Insane Bicycle Mechanic
 
Jeff Wills's Avatar
 
Join Date: Mar 2008
Location: other Vancouver
Bikes:
Posts: 7,951
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 17 Post(s)
If all else fails, Schedule 40 PVC pipe has a 1/16" wall thickness. It makes a perfect shim for a front derailleur that's one size too big. A 1 1/2" long piece works perfectly.

I bought a wrong-size front derailleur (doh!) and used a PVC shim to make it work. It's still there, working perfectly, 6 years later.
__________________
Jeff Wills

Comcast nuked my web page. It will return soon..
Jeff Wills 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 11:00 PM.