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 09-13-08, 05:53 PM   #1
Elad63
Senior Member
Thread Starter
 
Elad63's Avatar
 
Join Date: Dec 2005
Location: Enola, PA
Bikes: Too many to count. Changes on a frequent basis.
Posts: 731
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
RD Question

I picked up a 70's ten speed with a 5 speed cluster and friction barend shifters, wanting to go a little modern I put a newer rim with a 7 speed cluster on and adjusted the limit screws. The top end is ok, but I can't stop it from trying to jump around on the bottom. I adjusted the limit screws and cable tention to no avail. I am I missing something, or is this not possible with the rear derailler, The RD is a Shimano GT 300.

The bike is a 1973 World Voyageur, pic of bike attached.


Elad63 is offline   Reply With Quote
Old 09-13-08, 06:17 PM   #2
rhenning
Senior Member
 
Join Date: Apr 2006
Bikes:
Posts: 2,758
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 85 Post(s)
The rear derailleur on that bike is supposed to bethe first generation of Dura Ace as are many of the components on these bikes. It is called a Shimano Crane GS. A very good derailleur but It may not have enough enough range to shift 7 gears. I have used them with 6 speeds. I actually used one on my 1974 Paramount and it shifts about 100 percent better than the Campy Ralley. Here are of pictures of the derailleurs on my orange and yellow Voyagers. Roger
Attached Images
File Type: jpg PICT0005.JPG (56.1 KB, 9 views)
File Type: jpg PICT0007.JPG (55.7 KB, 11 views)
rhenning is offline   Reply With Quote
Old 09-13-08, 06:46 PM   #3
jsmithepa
Senior Member
 
Join Date: Sep 2007
Bikes:
Posts: 1,152
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I bet u need a narrower 7-speed chain.
jsmithepa is offline   Reply With Quote
Old 09-14-08, 05:41 AM   #4
Elad63
Senior Member
Thread Starter
 
Elad63's Avatar
 
Join Date: Dec 2005
Location: Enola, PA
Bikes: Too many to count. Changes on a frequent basis.
Posts: 731
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
I thought about the chain, I was planing on getting a new one anyways. Thanks for the tip.
Elad63 is offline   Reply With Quote
Old 09-14-08, 05:59 AM   #5
Retro Grouch 
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Catrike 559 I own some others but they don't get ridden very much.
Posts: 27,813
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 589 Post(s)
That looks to me like a freewheel with a 34 tooth big cog. Many rear derailleurs of that era were designed to only handle a 28 tooth big cog. If that's the case, you need a different rear derailleur. If you can find an old Suntour VGT, that would be perfect.
Retro Grouch is offline   Reply With Quote
Old 09-14-08, 06:59 AM   #6
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: 30,127
Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 591 Post(s)
Quote:
Originally Posted by jsmithepa View Post
I bet u need a narrower 7-speed chain.
Good point. If you kept the old 5-speed chain, that is likely your problem, or one of the problems. 7-speed and above need a "narrow" chain". You will find these listed as "8-speed" chains these days but it's the same thing.

You do not need then even narrower 9 or 10-speed chains.
HillRider is offline   Reply With Quote
Old 09-14-08, 08:52 AM   #7
Elad63
Senior Member
Thread Starter
 
Elad63's Avatar
 
Join Date: Dec 2005
Location: Enola, PA
Bikes: Too many to count. Changes on a frequent basis.
Posts: 731
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
thanks for the help, going to LBS today to go new chain
Elad63 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 11:35 PM.


 
  • Ask a Question
    get answers from real people!
Click to start entering your question.
I HAVE A QUESTION