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

Long rear derailleur for 11/32 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.

Long rear derailleur for 11/32 cassette

Old 08-18-10, 03:03 AM
  #1  
Senior Member
Thread Starter
 
Join Date: Jul 2010
Posts: 1,434
Liked 514 Times in 270 Posts
Long rear derailleur for 11/32 cassette

I recently purchased a Merlin extralight with 7800 dura ace drivetrain. Love the bike, but it is certainly not geared for my mountainous neck of the woods.

What ten speed rear derailleur would be a good choice to go with a 11/32 rear cassette?
abdon is offline  
Old 08-18-10, 03:16 AM
  #2  
LBS Employee/Commuter
 
Join Date: May 2008
Location: Madison Heights, MI
Posts: 243

Bikes: 2007 Trek Soho, 2010 Gary Fisher Monona w/ Xtracycle FreeRadical, 198X Facet BioTour 2000

Likes: 0
Liked 0 Times in 0 Posts
New Shimano XT/XTR is going to be 10 speed. I'm sure there will be a long cage of both that will accommodate 11-32 and still work with your Brifters.
bjoerges is offline  
Old 08-18-10, 08:19 AM
  #3  
Senior Member
 
well biked's Avatar
 
Join Date: Jul 2005
Posts: 7,496
Liked 167 Times in 92 Posts
Ironically, if you need to install a Shimano mtb rear derailleur to work with your road shifters, , you can use pretty much any Shimano mtb rear derailleur EXCEPT the new "10 speed Dyna Sys" models to work with your road shifters because Shimano has changed the cable pull ratio on these models. Keep in mind, the number of "speeds" is in the shifter, not the derailleur, it's the cable pull ratio that needs to match between shifter and derailleur. Also keep in mind that the cage length only affects chain wrap capacity, not largest cog compatibility.
well biked is offline  
Old 08-18-10, 08:44 AM
  #4  
Advisor
 
Join Date: Mar 2008
Location: Central New Jersey
Posts: 544
Likes: 0
Liked 2 Times in 1 Post
If yours is not a triple, you may want to consider putting a triple crank on. And a double, you may also want to consider a 34/46 crank, both with a 28 cassette. Small chainrings I think go down to a 24.
Lawrence08648 is offline  
Old 08-18-10, 08:52 AM
  #5  
Senior Member
 
Shimagnolo's Avatar
 
Join Date: May 2008
Location: Zang's Spur, CO
Posts: 9,090
Liked 5,651 Times in 2,932 Posts
Originally Posted by bjoerges
New Shimano XT/XTR is going to be 10 speed. I'm sure there will be a long cage of both that will accommodate 11-32 and still work with your Brifters.
Incorrect.
The new 10s "Dyna-Sys" mtn RD's have an incompatible cable pull.
The older 9s RD's will work with brifters.
Shimagnolo is offline  
Old 08-18-10, 10:12 AM
  #6  
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 33,656

Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!

Likes: 0
Liked 1,099 Times in 745 Posts
Originally Posted by Lawrence08648
If yours is not a triple, you may want to consider putting a triple crank on. And a double, you may also want to consider a 34/46 crank, both with a 28 cassette. Small chainrings I think go down to a 24.
Small chainrings for triple cranks with 74 mm bolt circles for the granny do go down to 24T. Compact doubles with 110 mm bolt circles will accept a 33T chainring as the minimum and 34T rings are far more common.

Installing a 9-speed XT or XTR rear derailleur should allow the 11x32 cassette to work with no other changes.
HillRider is offline  
Old 08-20-10, 05:15 AM
  #7  
Senior Member
Thread Starter
 
Join Date: Jul 2010
Posts: 1,434
Liked 514 Times in 270 Posts
I have a triple on my touring bike. This Merlin is meant for randonneuring-type riding; ultra light long distance.

I love the simplicity of the dual crank. 50/34 (or 33) front with an 11/32 rear ought to be low enough. This setup sacrifices close gearing, but I'm not willing to sacrifice the 50/11
abdon is offline  
Old 08-20-10, 07:03 AM
  #8  
Senior Member
 
Join Date: Jul 2010
Location: Augusta, Maine
Posts: 81

Bikes: Raleigh 12sp road, Specialized Hard Rock MTB, 1977 Schwinn Hurricane 5-speed

Likes: 0
Liked 0 Times in 0 Posts
Should a 52-42-30 front crank work with a 12/26 rear via a shimano 105rd with long cage? I took 2 links out of the 114 link 9sp chain because the cage didn't seem to be hanging right.
amillerinmaine is offline  
Old 08-20-10, 07:21 AM
  #9  
Banned.
 
Join Date: Aug 2010
Posts: 732
Likes: 0
Liked 0 Times in 0 Posts
I use an ultegra gs (long cage) on my triple with a 11-32 just screw the b screw all the way in to make sure you have enough clearance and I'd probably avoid using the 50/32 and the 34/11 combos.
cappuccino911 is offline  
Old 08-20-10, 07:27 AM
  #10  
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 33,656

Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!

Likes: 0
Liked 1,099 Times in 745 Posts
Originally Posted by cappuccino911
I use an ultegra gs (long cage) on my triple with a 11-32 just screw the b screw all the way in to make sure you have enough clearance and I'd probably avoid using the 50/32 and the 34/11 combos.
You got lucky. Most derailleur hangers won't let a Shimano road rear derailleur clear a 32T cog even with the B-screw all the way in.

Should a 52-42-30 front crank work with a 12/26 rear via a shimano 105rd with long cage?
Yes. It should work very well.
HillRider is offline  
Old 08-21-10, 07:13 PM
  #11  
Senior Member
Thread Starter
 
Join Date: Jul 2010
Posts: 1,434
Liked 514 Times in 270 Posts
On a compact setup, why is it that you don't see a chain ring smaller than 34 paired with the 50?
abdon is offline  
Old 08-21-10, 08:15 PM
  #12  
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 33,656

Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!

Likes: 0
Liked 1,099 Times in 745 Posts
Originally Posted by abdon
On a compact setup, why is it that you don't see a chain ring smaller than 34 paired with the 50?
Compact cranks almost universally have a 110 mm BCD (bolt circle diameter - the diameter of the circle on which the chainring bolts are set). This BCD will accept a 33T chainring as the absolute minimum and 34T is the most common size fitted by most makers.

If you want a smaller chainring, the next common bcd is 74 mm which will accept a minimum of a 24T chainring. This bcd is used for the "granny" chainring on most current road triple and older MTB triple cranks paired with a 130 mm or 110 bcd for the two larger rings.
HillRider is offline  
Old 08-22-10, 11:05 PM
  #13  
Senior Member
 
andrewluke's Avatar
 
Join Date: Oct 2009
Posts: 444
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by abdon
On a compact setup, why is it that you don't see a chain ring smaller than 34 paired with the 50?
Front derailleur capacity is another issue. most can only handle 16T though older models would be spec'd at 14T and still handle the gap of a compact. As stated, the BCD becomes an issue though.
andrewluke is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
masi61
Bicycle Mechanics
6
04-26-20 01:40 AM
jim_pridx
Bicycle Mechanics
15
10-11-19 10:11 PM
tarwheel
Bicycle Mechanics
12
04-05-16 01:13 PM
melcooke
Cyclocross and Gravelbiking (Recreational)
6
06-17-13 02:19 PM
abdon
Bicycle Mechanics
2
08-31-10 09:33 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 - Your Privacy Choices -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.