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

Cassette change must I change 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.

Cassette change must I change derailleur

Old 07-10-14, 08:54 AM
  #1  
Junior Member
Thread Starter
 
Join Date: Jul 2014
Location: Montreal
Posts: 5
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Cassette change must I change derailleur

Hello!
I have a 11:28, 10 speed SRAM cassette on a Giant cyclocross. I want to change to 11:32 or 34 for touring. Must I change my SRAM Rival derailleur and is there something else I must know? Thank you!
Have fun!

Last edited by Mike54; 07-10-14 at 09:00 AM.
Mike54 is offline  
Old 07-10-14, 09:11 AM
  #2  
Senior Member
 
Join Date: Jun 2010
Location: Pearland, Texas
Posts: 7,579

Bikes: Cannondale, Trek, Raleigh, Santana

Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 308 Post(s)
Liked 5 Times in 5 Posts
Originally Posted by Mike54
Hello!
I have a 11:28, 10 speed SRAM cassette on a Giant cyclocross. I want to change to 11:32 or 34 for touring. Must I change my SRAM Rival derailleur and is there something else I must know? Thank you!
Have fun!
It depends... SRAM Rival Rear Derailleur | Competitive Cyclist :

The SRAM Rival Rear Derailleur is available with two cage length options -- Medium and Short. The Medium has a maximum 37t chain wrap capacity and can handle up to a 32t cog. The Short cage version has a 33t chain wrap capacity and can handle a 28t cog.

Brad
bradtx is offline  
Old 07-10-14, 09:21 AM
  #3  
Junior Member
Thread Starter
 
Join Date: Jul 2014
Location: Montreal
Posts: 5
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Tank you! how do I know if I have a medium or a short?
Mike54 is offline  
Old 07-10-14, 09:37 AM
  #4  
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 38,914

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Mentioned: 140 Post(s)
Tagged: 1 Thread(s)
Quoted: 5892 Post(s)
Liked 2,753 Times in 1,536 Posts
Typically short cage derailleurs have the center/center distance between the pulleys in the 55mm range (varies by brand) and medium cages are roughly 70-75mm on centers.

More to consider.

Generally RDs have the identical body regardless of cage length. Sram RDs have the upper pulley mounted on center with the cage pivot bolt, so unless the Rival is an exception it means that changing the cage will have no (zero, nada) effect on the upper pulley position and maximum sprocket capacity (regardless of what the spec. says). So the ONLY consideration is chain take-up capacity.

If you measured your chain based on the big/big+ method, you'll need a longer chain to accommodate the larger sprocket, but there's an excellent chance you can keep the RD, especially if you're willing to forego using the inner with the smallest few rear sprockets. I'd say to hang on to your dough, replace the cassette and chain measuring according the big/big+1" method which sets the shortest safe length, adjust the B-screw to clear the sprocket and see how it goes.

BTW- if small/small take up is marginal, you can improve it slightly by using a larger lower pulley. This will probably give you about another tooth or so of take up.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

Just because I'm tired of arguing, doesn't mean you're right.

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.

Last edited by FBinNY; 07-10-14 at 10:43 AM.
FBinNY is offline  
Old 07-10-14, 01:00 PM
  #5  
Senior Member
 
Join Date: Feb 2005
Location: Oklahoma
Posts: 9,438

Bikes: Trek 5500, Colnago C-50

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 7 Times in 6 Posts
You will need to stay with a SRAM brand derailleur to be compatible with the rear shifter.
Al1943 is offline  
Old 07-10-14, 02:38 PM
  #6  
Senior Member
 
zukahn1's Avatar
 
Join Date: Oct 2011
Location: Fairplay Co
Posts: 9,550

Bikes: Current 79 Nishiki Custum Sport, Jeunet 620, notable previous bikes P.K. Ripper loop tail, Kawahara Laser Lite, Paramount Track full chrome, Raliegh Internatioanl, Motobecan Super Mirage. 59 Crown royak 3 speed

Mentioned: 26 Post(s)
Tagged: 1 Thread(s)
Quoted: 800 Post(s)
Liked 1,816 Times in 644 Posts
Yes the OP will need to stay with the same type SRAM DR for correct indexing most SRAM setups will handle a 30 or 32 big cog in the rear but likely not a 34. Also if the OP is fine with not being able to run few of the small gears with inner triple they may want to consier running a slightly smaller inner chainring.

Last edited by zukahn1; 07-10-14 at 02:45 PM.
zukahn1 is offline  
Old 07-10-14, 02:47 PM
  #7  
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 38,914

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Mentioned: 140 Post(s)
Tagged: 1 Thread(s)
Quoted: 5892 Post(s)
Liked 2,753 Times in 1,536 Posts
True, he has to stay within brand, but the question is whether or not he has to replace at all. I expect that he can probably get by with minor finagling and possibly accepting some limitations on small/small use.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

Just because I'm tired of arguing, doesn't mean you're right.

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline  
Old 07-10-14, 02:56 PM
  #8  
Senior Member
 
zukahn1's Avatar
 
Join Date: Oct 2011
Location: Fairplay Co
Posts: 9,550

Bikes: Current 79 Nishiki Custum Sport, Jeunet 620, notable previous bikes P.K. Ripper loop tail, Kawahara Laser Lite, Paramount Track full chrome, Raliegh Internatioanl, Motobecan Super Mirage. 59 Crown royak 3 speed

Mentioned: 26 Post(s)
Tagged: 1 Thread(s)
Quoted: 800 Post(s)
Liked 1,816 Times in 644 Posts
+1 I would expect they can get by with the current DR if they are willing to possible accpet some limitations on small/small and maybe big/big use.
zukahn1 is offline  
Old 07-10-14, 03:13 PM
  #9  
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 38,914

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Mentioned: 140 Post(s)
Tagged: 1 Thread(s)
Quoted: 5892 Post(s)
Liked 2,753 Times in 1,536 Posts
Originally Posted by zukahn1
+1 I would expect they can get by with the current DR if they are willing to possible accpet some limitations on small/small and maybe big/big use.
IMO limitations on big/big use are NEVER acceptable. (emergency repairs being the exception to all rules). The consequences of accidentally shifting into a combination that the chain cannot loop are too severe. I'd sooner accept limiting the use of the inner chainring to the top 3 or 4 rear sprockets than risk the risks of a too short chain.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

Just because I'm tired of arguing, doesn't mean you're right.

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline  
Old 07-10-14, 03:42 PM
  #10  
Junior Member
Thread Starter
 
Join Date: Jul 2014
Location: Montreal
Posts: 5
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I thank you all for your answers. I have A short derailleur. So what do I choose? I will start a new post.
Mike54 is offline  
Old 07-10-14, 04:09 PM
  #11  
Senior Member
 
Join Date: Feb 2005
Location: Oklahoma
Posts: 9,438

Bikes: Trek 5500, Colnago C-50

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 7 Times in 6 Posts
Originally Posted by Mike54
I thank you all for your answers. I have A short derailleur. So what do I choose? I will start a new post.
Your answer is in posts #2 and #5 , the SRAM Rival medium cage will run a 32 big cog.
Al1943 is offline  
Old 07-10-14, 04:48 PM
  #12  
Senior Member
 
Join Date: Sep 2003
Location: Allen, TX
Posts: 1,916

Bikes: Look 585

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 25 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
Originally Posted by FBinNY
IMO limitations on big/big use are NEVER acceptable. (emergency repairs being the exception to all rules). The consequences of accidentally shifting into a combination that the chain cannot loop are too severe. I'd sooner accept limiting the use of the inner chainring to the top 3 or 4 rear sprockets than risk the risks of a too short chain.
+1
I destroyed a Red RD like this. I didn't realize I was beyond the RD's capacity. I recommend the Force or Red WiFli RD. It's designed for 50/34 compact rings and Sram's 11-32 cassette. I use one with a Shimano 12-30 cassette with no problems.
bikepro is offline  
Old 07-10-14, 05:04 PM
  #13  
Junior Member
Thread Starter
 
Join Date: Jul 2014
Location: Montreal
Posts: 5
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Al1943
Your answer is in posts #2 and #5 , the SRAM Rival medium cage will run a 32 big cog.
Thank you, I know, but since I have to change maybe I should upgrade a little?
Mike54 is offline  
Old 07-10-14, 05:08 PM
  #14  
Junior Member
Thread Starter
 
Join Date: Jul 2014
Location: Montreal
Posts: 5
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Does any one know, if I could A mountain derailleur like the X9?
Mike54 is offline  
Old 07-10-14, 05:43 PM
  #15  
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 38,914

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Mentioned: 140 Post(s)
Tagged: 1 Thread(s)
Quoted: 5892 Post(s)
Liked 2,753 Times in 1,536 Posts
Originally Posted by Mike54
Thank you, I know, but since I have to change maybe I should upgrade a little?
This is the $60 question. You might not HAVE to change. But whether you have to or just want to, your]\'re right that an upgrade makes sense at this time. Check your total take up requirements -- the sum of the differences big and smallest front and back --- and buy something with that or more capacity. I don't know the Sram line or prices these days, but maybe a Force might make sense if the price difference isn't large.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

Just because I'm tired of arguing, doesn't mean you're right.

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
rms13
Bicycle Mechanics
8
07-17-14 03:07 PM
fowler98
Bicycle Mechanics
14
01-14-14 10:00 AM
Urban Turkey
Bicycle Mechanics
5
07-07-11 07:03 PM
NeezyDeezy
Cyclocross and Gravelbiking (Recreational)
4
08-06-10 11:24 AM

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
Trackbacks are Off
Pingbacks are Off
Refbacks are 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.