Go Back  Bike Forums > Bike Forums > Tandem Cycling
Reload this Page >

I need a front triple derailleur

Notices
Tandem Cycling A bicycle built for two. Want to find out more about this wonderful world of tandems? Check out this forum to talk with other tandem enthusiasts. Captains and stokers welcome!

I need a front triple derailleur

Old 02-04-21, 08:28 AM
  #1  
RichinSC1
Member
Thread Starter
 
Join Date: Jan 2021
Location: Charleston, SC
Posts: 48
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 30 Post(s)
Likes: 0
Liked 12 Times in 5 Posts
I need a front triple derailleur

I bought a shimano tourney triple for a 7 speed but the inside of the deralleur hits the middle ring when I shift to the big ring. I even tried to mount it higher than the 2mm clearance recommendation but the throw is not far enough to reach all 3 rings. When I look online for trouble shooting I see many reviews that indicate many people have the same issue. So I am bagging the Tourney and going with different shimano model. What do you suggest? I am not trying to brake the bank. Thanks,
RichinSC1 is offline  
Old 02-04-21, 08:43 AM
  #2  
OneIsAllYouNeed
Long-term wear tester
 
Join Date: Dec 2006
Location: Seacoast, NH
Posts: 754

Bikes: Cycles Chinook travel/gravel/family tandem, KHS CX200 road/gravel, Voodoo Agwe fixie commuter, Gunnar Sport travel/road, Motobecane Boris fatbike

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 232 Post(s)
Liked 33 Times in 24 Posts
Originally Posted by RichinSC1 View Post
I bought a shimano tourney triple for a 7 speed but the inside of the deralleur hits the middle ring when I shift to the big ring. I even tried to mount it higher than the 2mm clearance recommendation but the throw is not far enough to reach all 3 rings. When I look online for trouble shooting I see many reviews that indicate many people have the same issue. So I am bagging the Tourney and going with different shimano model. What do you suggest? I am not trying to brake the bank. Thanks,
Most triple front derailleurs are made for a specific combination of chainring sizes. Your best bet is to search for one whose spec sheet lists your exact chainring sizes. You'll find an assortment from Shimano, Campagnolo, SRAM, and Microshift. If possible try to match the shifter brand and approximate year to the derailleur, but don't get hung up on it.
OneIsAllYouNeed is offline  
Old 02-04-21, 12:10 PM
  #3  
Joint Venture
Senior Member
 
Join Date: Sep 2017
Posts: 84
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 25 Post(s)
Liked 5 Times in 5 Posts
Are you still running the original 52/48/28 “half-step plus granny” ring sizes that were stock on a 1990 Burly Duet? The original drivetrain was 3x6 Suntour with bar-end shifters. If not, what’s you’re drivetrain set up? Most triple FD’s made any time recently need a 10 or 12t difference between middle and outer rings.
Joint Venture is offline  
Old 02-04-21, 12:14 PM
  #4  
RichinSC1
Member
Thread Starter
 
Join Date: Jan 2021
Location: Charleston, SC
Posts: 48
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 30 Post(s)
Likes: 0
Liked 12 Times in 5 Posts
Yes using original rings on front and upgraded to brifters
RichinSC1 is offline  
Old 02-04-21, 05:34 PM
  #5  
bwebel
Junior Member
 
Join Date: May 2014
Posts: 157
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 37 Post(s)
Likes: 0
Liked 6 Times in 6 Posts
Originally Posted by RichinSC1 View Post
Yes using original rings on front and upgraded to brifters
What brifters are you using? Unless they are older Campy, you are likely going to have to match the brifters and the front derailleur. The cable pull needs to match or it will not index well.
bwebel is offline  
Old 02-04-21, 05:59 PM
  #6  
RichinSC1
Member
Thread Starter
 
Join Date: Jan 2021
Location: Charleston, SC
Posts: 48
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 30 Post(s)
Likes: 0
Liked 12 Times in 5 Posts
Microshift
RichinSC1 is offline  
Old 02-04-21, 07:30 PM
  #7  
Joint Venture
Senior Member
 
Join Date: Sep 2017
Posts: 84
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 25 Post(s)
Liked 5 Times in 5 Posts
Originally Posted by RichinSC1 View Post
Yes using original rings on front and upgraded to brifters
Try changing the middle ring down to 39-42t from the 48t half-step setup.
Joint Venture is offline  
Old 02-04-21, 09:17 PM
  #8  
Ross200
Junior Member
 
Join Date: Feb 2019
Posts: 135
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 45 Post(s)
Liked 35 Times in 30 Posts
A lack of "throw" might indicate an incompatibility between the brifters and the FD. Are your new brifters dropper or flat bar? Current Tourney offerings seem to be flat bar only. Front chainline for many of the Tourney models is listed as 50 mm What is your current chainline? If you have enough "throw", you can often raise the derailleur quite a bit over 2 mm and still have acceptable shifting if the "throw' is adequate.

The inner cage hitting the middle chainring on upshift is a function of newer shaped inner cages and non-spec chainring sizes. Shimano 5503/6503 front derailleurs have a more forgiving shape that shifts well over a wider range of chainring differences, even half step, with brifters. CX50/70 might also work, depending again on your chainline.
Ross200 is offline  
Old 02-05-21, 12:05 PM
  #9  
RichinSC1
Member
Thread Starter
 
Join Date: Jan 2021
Location: Charleston, SC
Posts: 48
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 30 Post(s)
Likes: 0
Liked 12 Times in 5 Posts
Originally Posted by Joint Venture View Post
Try changing the middle ring down to 39-42t from the 48t half-step setup.
Great suggestion! I took off the middle ring (48t) and replaced it with one of my rings (40t) from the timing chain just to see if it worked and it does, no more rub while trying to go to the big ring.
Still not quite enough throw, its very close. I'm still tinkering with it.
Now I need to order another 40t for the timing chain.
RichinSC1 is offline  
Old 02-05-21, 12:25 PM
  #10  
jim_pridx
Senior Member
 
jim_pridx's Avatar
 
Join Date: May 2009
Location: WI
Posts: 261

Bikes: 2010 Bob Brown Cycles tandem, 2019 Co-Mo Carrera tandem, 1980 Richardson tandem, 2014 Cervelo R3, 2018 Specialized Roubaix, 1985 Bianchi Campione, 1983 Trek 720, 2020 Trek Fuel EX8, 2021 Salsa Mukluk

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 72 Post(s)
Liked 114 Times in 70 Posts
I don't mean to be stating the obvious, for you've probably looked at this already, but a lack of travel in the FD might also mean that there isn't enough tension in the derailleur cable. I've neglected to check this more times than I care to admit, but sometimes a little tug to tighten the cable a little further will solve the problem.
jim_pridx is offline  
Old 02-05-21, 12:28 PM
  #11  
RichinSC1
Member
Thread Starter
 
Join Date: Jan 2021
Location: Charleston, SC
Posts: 48
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 30 Post(s)
Likes: 0
Liked 12 Times in 5 Posts
Originally Posted by jim_pridx View Post
I don't mean to be stating the obvious, for you've probably looked at this already, but a lack of travel in the FD might also mean that there isn't enough tension in the derailleur cable. I've neglected to check this more times than I care to admit, but sometimes a little tug to tighten the cable a little further will solve the problem.
Yes I have inspected that already, thanks
And I have unscrewed both the high and low limit screws.
RichinSC1 is offline  
Likes For RichinSC1:
Old 02-05-21, 12:42 PM
  #12  
act0fgod
Junior Member
 
Join Date: Oct 2009
Location: Colorado Springs
Posts: 128

Bikes: Specialized Tarmac Pro, Bilenky Coupled Tandem, Calfee Tetra Tandem

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 31 Post(s)
Liked 15 Times in 10 Posts
Originally Posted by Ross200 View Post
Front chainline for many of the Tourney models is listed as 50 mm What is your current chainline? If you have enough "throw", you can often raise the derailleur quite a bit over 2 mm and still have acceptable shifting if the "throw' is adequate.

The inner cage hitting the middle chainring on upshift is a function of newer shaped inner cages and non-spec chainring sizes. Shimano 5503/6503 front derailleurs have a more forgiving shape that shifts well over a wider range of chainring differences, even half step, with brifters. CX50/70 might also work, depending again on your chainline.
Chainline is something I don't quite understand but feel like creates a number of problems for tandems because we want wide gear ranges.

As I understand it chainline basically refers to the distance from the center of the bike to the center of the chain. What sort of chainline is required and how the front chainline should relate to the rear chainline isn't something I understand and think trial and error is the solution, but don't really know.

For example on one of our tandems we are using SRAM Etap. Up front we have a 50-36 in the rear we are using 9-34 cassette. When in the 50 up front and the 9 in the rear the chain skips when we really push hard and wants to jump up to the next bigger gear. I figure this is a chainline issue, but not really sure.
act0fgod is offline  
Old 02-05-21, 01:45 PM
  #13  
RichinSC1
Member
Thread Starter
 
Join Date: Jan 2021
Location: Charleston, SC
Posts: 48
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 30 Post(s)
Likes: 0
Liked 12 Times in 5 Posts
[QUOTE=Ross200;21910354]A lack of "throw" might indicate an incompatibility between the brifters and the FD. Are your new brifters dropper or flat bar? Current Tourney offerings seem to be flat bar only. Front chainline for many of the Tourney models is listed as 50 mm What is your current chainline? If you have enough "throw",

My chainline is 50mm when measure center of tube to center of middle ring.
Measuring center of tube to center of big ring is 58mm
RichinSC1 is offline  
Old 02-05-21, 02:35 PM
  #14  
Ross200
Junior Member
 
Join Date: Feb 2019
Posts: 135
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 45 Post(s)
Liked 35 Times in 30 Posts
After switching the ring(s) and backing off the limit screws, does the FD have enough range to get all three rings if you disconnect the cable?
Ross200 is offline  
Old 02-05-21, 03:45 PM
  #15  
RichinSC1
Member
Thread Starter
 
Join Date: Jan 2021
Location: Charleston, SC
Posts: 48
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 30 Post(s)
Likes: 0
Liked 12 Times in 5 Posts
Originally Posted by Ross200 View Post
After switching the ring(s) and backing off the limit screws, does the FD have enough range to get all three rings if you disconnect the cable?
After fine tuning it now works as advertised! The key was switching to 40t middle ring.

Thanks all who helped.
RichinSC1 is offline  
Likes For RichinSC1:
Old 02-07-21, 04:28 PM
  #16  
Chris_W
Likes to Ride Far
 
Chris_W's Avatar
 
Join Date: May 2007
Location: Switzerland
Posts: 2,341

Bikes: road+, gravel, commuter/tourer, tandem, e-cargo, folder

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 32 Post(s)
Liked 8 Times in 8 Posts
Road triple FDs are designed for a chainline of 45mm to the middle ring, so I'm surprised it's working with 50mm, which is more MTB spacing. Unfortuntely, MTB FDs don't work with road shifters. Tandem-specific extended FD clamp-on mounts exist to solve this problem.
Chris_W 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 - Do Not Sell My Personal Information -

Copyright © 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.