Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

Do I need a long cage derailleur?

Notices
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.

Do I need a long cage derailleur?

Old 11-22-22, 10:12 PM
  #26  
oldbobcat
Senior Member
 
oldbobcat's Avatar
 
Join Date: Jul 2005
Location: Boulder County, CO
Posts: 4,370

Bikes: '80 Masi Gran Criterium, '12 Trek Madone, early '60s Frejus track

Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 508 Post(s)
Liked 434 Times in 331 Posts
By any measure, a 42t rear cog is HUGE. Yes, you do.
oldbobcat is offline  
Old 11-23-22, 12:03 AM
  #27  
Camilo
Senior Member
 
Join Date: Apr 2007
Posts: 6,760
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 1106 Post(s)
Liked 1,197 Times in 758 Posts
Originally Posted by fooferdoggie
on our tandem we have a 46 chain ring and a 11-32 or 34 cassette. I want to put a 11-42 cassette on. I don't know if the medium cage xt will do it with extra chain or should I put a long cage on? its a 10 speed setup.
Just look up the max sprocket size and max chain wrap for your derailleur. That info is readily available.
Camilo is offline  
Old 11-24-22, 06:52 AM
  #28  
Hondo6
Senior Member
 
Join Date: Sep 2021
Location: SW Florida, USA
Posts: 1,295

Bikes: Yes

Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 540 Post(s)
Liked 656 Times in 456 Posts
Originally Posted by Camilo
Just look up the max sprocket size and max chain wrap for your derailleur. That info is readily available.
I posted links for the Shimano specifications for both GS and SGS models above. They're also listed in the 2019-2020 Shimano specification handbook.

Dunno if the OP has looked at them or not.

I suspect the OP may need a derailleur hanger extender ("goatlink" or equivalent) to use the GS with an 11-42. But it's at least theoretically possible he might get lucky without one.
Hondo6 is offline  
Likes For Hondo6:
Old 12-15-22, 11:31 AM
  #29  
fooferdoggie 
Senior Member
Thread Starter
 
Join Date: Jan 2020
Posts: 2,343
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 679 Post(s)
Liked 945 Times in 552 Posts
I had my local trek store do it as I would have to had to do the work in the rain as my garage has no light and not a l t of room. plus they are less then a mile away. its great we can climb 16+ hills with a lot less assist and less work on our part. now we can spin up hills and our battery should go longer.
fooferdoggie 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 © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.