Go Back  Bike Forums > Bike Forums > Classic & Vintage
Reload this Page >

Front derailleur width???

Classic & Vintage This forum is to discuss the many aspects of classic and vintage bicycles, including musclebikes, lightweights, middleweights, hi-wheelers, bone-shakers, safety bikes and much more.

Front derailleur width???

Old 03-16-19, 08:10 AM
  #1  
big chainring 
Senior Member
Thread Starter
 
Join Date: Sep 2007
Location: Wilmette, IL
Posts: 6,392
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 367 Post(s)
Front derailleur width???

Referring to the space between inside and outside of the front derailleur cage. Is there a standard width? Seems like everytime I set up a bike I am squeezing the cage to keep the front derailleur from throwing the chain. Granted I am using 40 and 50 year old parts...and I think a lot of bell bottom jeans got caught up in front derailleur chainring interface. And perhaps with thinner modern chains the space between the cage can be tighter than with the old "10 speed" chains.
big chainring is offline  
Old 03-16-19, 10:00 AM
  #2  
52telecaster
ambulatory senior
 
52telecaster's Avatar
 
Join Date: Dec 2016
Location: Peoria Il
Posts: 2,561

Bikes: Bob Jackson World Tour, 81 miyata 912 and 86 miyata 312.

Mentioned: 31 Post(s)
Tagged: 0 Thread(s)
Quoted: 797 Post(s)
They got thinner as chains got thinner. I know very little.
52telecaster is offline  
Old 03-16-19, 10:09 AM
  #3  
bikeaddiction1
Senior Member
 
Join Date: Jan 2015
Location: Calgary Alberta Canada
Posts: 108
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 31 Post(s)
I have straightened bent front derailleurs, especially on old bikes. However the usual cause to the chain being thrown is either the limit screw is out too far, or the derailleur is not mounted straight.
bikeaddiction1 is offline  
Old 03-16-19, 12:31 PM
  #4  
noglider 
aka Tom Reingold
 
noglider's Avatar
 
Join Date: Jan 2009
Location: West Village, New York City
Posts: 36,742

Bikes: 1962 Rudge Sports, 1971 Raleigh Super Course, 1971 Raleigh Pro Track, 1973 Raleigh Twenty, 1974 Raleigh International, 1975 Viscount Fixie, 1982 McLean, 1996 Lemond (Ti), 2002 Burley Zydeco tandem

Mentioned: 399 Post(s)
Tagged: 0 Thread(s)
Quoted: 5172 Post(s)
I believe the space between the plates has increased over time, because cassettes have gotten wider. I would not squeeze the plates together. I would bend a single plate in at the bottom.

I worked briefly at a bike shop in 2014. The owner was a brilliant mechanic. He looked at a front derailleur I had set up and told me it was wrong. He whacked it once with the big channel lock that happened to be in his hand and said, "THAT's the way it should be." It was like a hole in one in golf. What a hand that guy had.
__________________
Tom Reingold, tom@noglider.com
New York City and High Falls, NY
Blogs: The Experienced Cyclist; noglider's ride blog

“When man invented the bicycle he reached the peak of his attainments.” — Elizabeth West, US author

Please email me rather than PM'ing me. Thanks.
noglider is offline  
Old 03-16-19, 02:15 PM
  #5  
stardognine
Turquoise gatherer.
 
stardognine's Avatar
 
Join Date: Jan 2016
Location: Arid Arizona, for now.
Posts: 1,326

Bikes: 1985 Cannondale ST400

Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
Quoted: 260 Post(s)
I heard that the other day, that bell bottoms are coming back. 😎✌️😎
glider, I hope your former boss yelled "fore", lol. Otherwise, he might have whacked someone's fingers, who was just trying to help out. 😁😉
stardognine is offline  
Old 03-16-19, 05:26 PM
  #6  
ascherer 
Senior Member
 
ascherer's Avatar
 
Join Date: Jul 2007
Location: Manhattan
Posts: 973

Bikes: 1987 Mercian Pro, 1971 Raleigh International, 1971 Peugeot PX-10E, 1966 Raleigh Sports

Mentioned: 44 Post(s)
Tagged: 0 Thread(s)
Quoted: 225 Post(s)
Originally Posted by noglider View Post
I believe the space between the plates has increased over time, because cassettes have gotten wider. I would not squeeze the plates together. I would bend a single plate in at the bottom.

I worked briefly at a bike shop in 2014. The owner was a brilliant mechanic. He looked at a front derailleur I had set up and told me it was wrong. He whacked it once with the big channel lock that happened to be in his hand and said, "THAT's the way it should be." It was like a hole in one in golf. What a hand that guy had.
I suspect I know who that is...great story!
ascherer is offline  
Old 03-18-19, 08:35 AM
  #7  
noglider 
aka Tom Reingold
 
noglider's Avatar
 
Join Date: Jan 2009
Location: West Village, New York City
Posts: 36,742

Bikes: 1962 Rudge Sports, 1971 Raleigh Super Course, 1971 Raleigh Pro Track, 1973 Raleigh Twenty, 1974 Raleigh International, 1975 Viscount Fixie, 1982 McLean, 1996 Lemond (Ti), 2002 Burley Zydeco tandem

Mentioned: 399 Post(s)
Tagged: 0 Thread(s)
Quoted: 5172 Post(s)
Originally Posted by ascherer View Post


I suspect I know who that is...great story!
Yes you know him. No one else would do that. I trust no one else to do repairs with the "wrong" tools, but his hands are that magical.
__________________
Tom Reingold, tom@noglider.com
New York City and High Falls, NY
Blogs: The Experienced Cyclist; noglider's ride blog

“When man invented the bicycle he reached the peak of his attainments.” — Elizabeth West, US author

Please email me rather than PM'ing me. Thanks.
noglider is offline  

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


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.