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

105 Longcage + MTB Cassette?

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.

105 Longcage + MTB Cassette?

Old 03-26-07, 02:31 PM
  #1  
dynaryder
PatronSaintOfDiscBrakes
Thread Starter
 
dynaryder's Avatar
 
Join Date: Apr 2005
Location: BicycleSPACE warehouse in SW Washington DC
Posts: 6,980
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
105 Longcage + MTB Cassette?

Long story short,I'm looking to re-gear my Element cross bike for the street. I've got a new 11-34 SRAM cassette laying around and I'm considering swapping it for the stock 12-26. Rear spacing is fine and they're both 9sp. I can't find any info about the 9sp 105 derailleurs on Shimano's site. I know the short cage one's won't handle this cassette,but I think this one might. I measured the distance between the pulley spindles and it came to about 84mm. I also measured the one on my Coda which has a Deore XT and an 11-32 cassette,and it came to about 86mm. Think the 11-34 will work with the 105? Thanks in advance.
__________________

C'dale BBU('05 and '09)/Super Six/Hooligan8and 3,Kona Dew Deluxe,Novara Buzz/Safari,Surly Big Dummy,Marin Pt Reyes,Giant Defy 1,Schwinn DBX SuperSport,Dahon Speed Pro TT,Brompton S6L/S2E-X
dynaryder is offline  
Old 03-26-07, 03:17 PM
  #2  
Al1943
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 4 Times in 3 Posts
Cage length is all about chainwrap capacity. The largest possible cog is more about the derailleur's upper parallelagram. For cogs larger than 30 you will need a mountain bike type derailleur. Shimano road derailleurs, short and long cage, are rated to 27 tooth maximum cog size but will usually go to 30.

Al
Al1943 is offline  
Old 03-26-07, 03:27 PM
  #3  
Little Darwin
The Improbable Bulk
 
Little Darwin's Avatar
 
Join Date: Jul 2005
Location: Wilkes-Barre, PA
Posts: 8,401

Bikes: Many

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Likes: 0
Liked 6 Times in 6 Posts
I agree, if you really want a 34, then something like a Deore LX should do the job well.

Not all Shimano mountain RDs are rated for 34 teeth, so you should check whichever RD you get if you go that direction.
__________________
Slow Ride Cyclists of NEPA

People do not seem to realize that their opinion of the world is also a confession of character.
- Ralph Waldo Emerson
Little Darwin is offline  
Old 03-26-07, 08:22 PM
  #4  
Crank57
Senior Member
 
Crank57's Avatar
 
Join Date: Jan 2007
Location: Middle Tennessee
Posts: 177

Bikes: Giant OCR2, FCR2, Cypress

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
I have been looking at the same change. I have two Giants, an OCR-2 with Shimano 105 RD, 12-26Tooth cassette and a FCR-2 with a Shram X7 RD and also a 12-26 Tooth cassette. I want to switch to 11-32 or 34 tooth cog set. My smallest chainring is 30Tooth on both bikes. I'm just trying to get to lower than 1:1 ratio fo my lowest gear on at least one of these bikes. Will the Shram X7 handle the change any better than the Shimano 105? Will a MTB RD mount the same as the road bike RD?
Crank57 is offline  
Old 03-26-07, 09:53 PM
  #5  
vanwagda
Newbie
 
Join Date: Mar 2007
Location: Nevada
Posts: 1

Bikes: Specialized Allez Sport

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I rode the Deathride last year with a 34 tooth cassette. I had to take off my 105 deraileur and use my XT deraileur because the jockey pulley hit the 34 tooth and made a racket. Seemed to work ok on 30 tooth cog though.
vanwagda is offline  
Old 03-26-07, 10:56 PM
  #6  
fiver
Senior Member
 
Join Date: Apr 2005
Location: Eugene OR
Posts: 130

Bikes: VooDoo Limba, 2000 GF Kai Tai, old lugged fixies

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
What is the range of the crank set you have. You can't calculate chain wrap capacity without taking the crank into consideration.
Subtract the small ring from the big wring on the cassette and the chain rings, then add these numbers.

Ex. (34-11) + (44-22) = 45 This is your chain wrap capacity.

After calculating this number, either ask your LBS to look up the derailleur and give you the CWP, or let me know and I'll look it up at work.

I'm not sure if SHimano would list this on their site or not.
fiver is offline  
Old 03-27-07, 04:12 AM
  #7  
Retro Grouch 
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Posts: 30,225

Bikes: Catrike 559 I own some others but they don't get ridden very much.

Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 1570 Post(s)
Liked 638 Times in 359 Posts
Originally Posted by Crank57
I . I want to switch to 11-32 or 34 tooth cog set. My smallest chainring is 30Tooth on both bikes. . Will the Shram X7 handle the change any better than the Shimano 105? Will a MTB RD mount the same as the road bike RD?
Yes and no.

The SRAM X.7 has a 34 large rear cog capability and 45 tooth chain wrap capacity, so it'll handle the cassette. The ESP, however, is a 1:1 cable pull derailleur so it won't work with Shimano shifters.
Retro Grouch 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 or Share My Personal Information -

Copyright © 2023 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.