Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

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!

User Tag List

Reply
 
Thread Tools Search this Thread
Old 01-01-08, 12:37 PM   #1
antiquepedaler
Senior Member
Thread Starter
 
antiquepedaler's Avatar
 
Join Date: Oct 2007
Location: In the airstream above
Bikes: Santana, Ventana, Rivendell, Giant
Posts: 72
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Type A or Type B chainrings?

Does anyone know if there is any difference in using either Shimano Ultegra Type A or Type B chainrings as replacements on the idler side of a tandem? In shopping around I see both but no explanation of the difference.
antiquepedaler is offline   Reply With Quote
Old 01-01-08, 01:42 PM   #2
TandemGeek
hors category
 
TandemGeek's Avatar
 
Join Date: Jan 2002
Bikes:
Posts: 7,208
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by antiquepedaler View Post
Does anyone know if there is any difference in using either Shimano Ultegra Type A or Type B chainrings as replacements on the idler side of a tandem? In shopping around I see both but no explanation of the difference.
It hardly even matters on the drive side.

In Shimano's pursuit of "perfect shifting" it created matched sets of chainrings for it's STI bikes, e.g., 52/39 A-type rings and 53/42 B-type rings or something like that... I'm going from memory here. The ramps and pins are positioned to optimize the upshifts and downshifts for the different pairs but, in practice, folks have mixed and matched A-type and B-type rings with no perceived difference in shifting performance, perhaps even less dramatic than using a SRAM chain on a Shimano drive train.
TandemGeek is offline   Reply With Quote
Old 01-01-08, 02:00 PM   #3
antiquepedaler
Senior Member
Thread Starter
 
antiquepedaler's Avatar
 
Join Date: Oct 2007
Location: In the airstream above
Bikes: Santana, Ventana, Rivendell, Giant
Posts: 72
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by TandemGeek View Post
It hardly even matters on the drive side.

In Shimano's pursuit of "perfect shifting" it created matched sets of chainrings for it's STI bikes, e.g., 52/39 A-type rings and 53/42 B-type rings or something like that... I'm going from memory here. The ramps and pins are positioned to optimize the upshifts and downshifts for the different pairs but, in practice, folks have mixed and matched A-type and B-type rings with no perceived difference in shifting performance, perhaps even less dramatic than using a SRAM chain on a Shimano drive train.
Thanks, Mark!

Jay
antiquepedaler 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 10:59 PM.