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

What Rear Mech with 11-34T ?

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.

What Rear Mech with 11-34T ?

Old 01-23-21, 10:04 AM
  #1  
grahameinlondon
Newbie
Thread Starter
 
Join Date: Jan 2021
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
What Rear Mech with 11-34T ?

Any help would be most appreciated.

What new rear derailleur do I need to work with my current shifters and new cassette? Is there more than 1 option?

My 10 speed road bike. For hill climbing, I am upgrading my rear cassette from 11-28T to 11-34T (CS-HG500-10).

I have Ultegra ST-6600 shifters, which I would like to use. At present I have Shimano Ultegra Rear Derailleur RD-6600,

Front rings are SG-X 53B and SG-X 39B. Capacity of drivetrain is 37.

Many thanks Grahame
grahameinlondon is offline  
Old 01-23-21, 10:25 AM
  #2  
cxwrench
Senior Member
 
cxwrench's Avatar
 
Join Date: Jul 2013
Location: Nor-Cal
Posts: 1,694

Bikes: lots

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 752 Post(s)
Liked 918 Times in 525 Posts
ANY 8 or 9 speed mtb derailleur that matches your needs. Most of the 'current' Shimano 9 speed mtb derailleurs only come in SGS (long cage). That will work fine for you. Some of the older GS (medium cage) derailleurs would probably work as well, just confirm the capacity spec.
cxwrench is offline  
Likes For cxwrench:
Old 01-23-21, 10:35 AM
  #3  
Supercardplayer
Junior Member
 
Join Date: Jan 2021
Posts: 13

Bikes: 2006 felt f5c every thing but the frame upgraded to Ultegra hunt aero wide wheels I dose the job

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
good question I have a solution

Good question I have a 34 tooth cassette on my bike. so you have to good options get a medium cage road derailleur that will work with that cassete just fine . meanwhile my setup is a short cage dearllier with a wolf tooth road link dearlier extender that will work with a bigger cassete. the road link basically makes the derailleur hanger longer. another options is if you're running 9 speed road you can youse a mountain bike derailleur and it will work fine with that cassette if you're running a 9 speed setup. so those are you're options.
Supercardplayer is offline  
Old 01-23-21, 10:54 AM
  #4  
grahameinlondon
Newbie
Thread Starter
 
Join Date: Jan 2021
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Thanks so much. But I don't understand how a 9 speed derailleur will work on a 10 speed? Where can I find the pull ratio for my ST6600 shifters?
grahameinlondon is offline  
Old 01-23-21, 11:03 AM
  #5  
Bill Kapaun
Really Old Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Posts: 12,677

Bikes: 87 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.

Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 1341 Post(s)
Liked 564 Times in 426 Posts
Originally Posted by grahameinlondon View Post
Thanks so much. But I don't understand how a 9 speed derailleur will work on a 10 speed? Where can I find the pull ratio for my ST6600 shifters?
The difference in pull amount is in the shifter. 7-9 speed for road & mountain RDER's (with rare exception(s) you don't have to worry about) are all the same ratio.
As the number of cogs go up, cog spacing gets closer so the shifter pulls proportionately less.
The shifter is the master and the RDER is the slave.
Bill Kapaun is offline  
Likes For Bill Kapaun:
Old 01-23-21, 11:15 AM
  #6  
cxwrench
Senior Member
 
cxwrench's Avatar
 
Join Date: Jul 2013
Location: Nor-Cal
Posts: 1,694

Bikes: lots

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 752 Post(s)
Liked 918 Times in 525 Posts
Originally Posted by Supercardplayer View Post
Good question I have a 34 tooth cassette on my bike. so you have to good options get a medium cage road derailleur that will work with that cassete just fine . meanwhile my setup is a short cage dearllier with a wolf tooth road link dearlier extender that will work with a bigger cassete. the road link basically makes the derailleur hanger longer. another options is if you're running 9 speed road you can youse a mountain bike derailleur and it will work fine with that cassette if you're running a 9 speed setup. so those are you're options.
No, there are no 10spd road derailleur that work w/ a 34t cog. And while a Wolftooth road link will allow the derailleur to clear a larger cog than it's made to work with it won't magically make the cage any longer so it won't wrap the extra chain needed for the larger cog. This info is posted on the WT site. You clearly don't understand how rear derailleurs work and what 'capacity' is. Stop giving advice til you know what you're talking about.
cxwrench is offline  
Old 01-23-21, 11:19 AM
  #7  
woodcraft
Senior Member
 
woodcraft's Avatar
 
Join Date: Apr 2012
Location: Nor Cal
Posts: 5,752
Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 1697 Post(s)
Likes: 0
Liked 757 Times in 463 Posts
Originally Posted by Supercardplayer View Post
Good question I have a 34 tooth cassette on my bike. so you have to good options get a medium cage road derailleur that will work with that cassete just fine . meanwhile my setup is a short cage dearllier with a wolf tooth road link dearlier extender that will work with a bigger cassete. the road link basically makes the derailleur hanger longer. another options is if you're running 9 speed road you can youse a mountain bike derailleur and it will work fine with that cassette if you're running a 9 speed setup. so those are you're options.

+1

$20 for the Road Link plus a new chain and you're in business.
woodcraft is offline  
Old 01-23-21, 11:24 AM
  #8  
wgscott
Banned.
 
Join Date: Jul 2013
Location: CZU
Posts: 7,130
Mentioned: 61 Post(s)
Tagged: 0 Thread(s)
Quoted: 2366 Post(s)
Liked 2,229 Times in 1,110 Posts
Originally Posted by cxwrench View Post
Stop giving advice til you know what you're talking about.
My wife has a 10 speed road derailleur on her bike and an 11-36T (SRAM) cassette. I very much respect your knowledge and experience, and I realize what she has is out of official Shimano spec, but it does work perfectly fine and has done so for several years without incident (the shifting works well, even on the 36T cog). My own case is 11-speed, but my first-generation Ultegra Di2 medium cage is specced for 32T max, but it works fine on 36T and 34T and without any deterioration in shifting quality or component life. Shimano is very conservative with their recommendations.
wgscott is offline  
Old 01-23-21, 11:32 AM
  #9  
woodcraft
Senior Member
 
woodcraft's Avatar
 
Join Date: Apr 2012
Location: Nor Cal
Posts: 5,752
Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 1697 Post(s)
Likes: 0
Liked 757 Times in 463 Posts
Originally Posted by cxwrench View Post
No, there are no 10spd road derailleur that work w/ a 34t cog. And while a Wolftooth road link will allow the derailleur to clear a larger cog than it's made to work with it won't magically make the cage any longer so it won't wrap the extra chain needed for the larger cog. This info is posted on the WT site. You clearly don't understand how rear derailleurs work and what 'capacity' is. Stop giving advice til you know what you're talking about.

I have a Force 10 sp medium cage RD that absolutely works with 11/34 cassette,

and have been running short cage RD/ Road link 11/34 & 34/48 for several years without issue (there is a little slack in small/small which I never use).

Lighten up on a new poster.
woodcraft is offline  
Likes For woodcraft:
Old 01-23-21, 11:52 AM
  #10  
Bill Kapaun
Really Old Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Posts: 12,677

Bikes: 87 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.

Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 1341 Post(s)
Liked 564 Times in 426 Posts
Originally Posted by Supercardplayer View Post
Good question I have a 34 tooth cassette on my bike. so you have to good options get a medium cage road derailleur that will work with that cassete just fine . meanwhile my setup is a short cage dearllier with a wolf tooth road link dearlier extender that will work with a bigger cassete. the road link basically makes the derailleur hanger longer. another options is if you're running 9 speed road you can youse a mountain bike derailleur and it will work fine with that cassette if you're running a 9 speed setup. so those are you're options.
Just because it works on YOUR bike with YOUR UNSPECIFIED RDER doesn't mean it'll work on someone else's bike.
RDER hangar geometry can vary between different bikes.
OP already has a MEDIUM cage RDER.
Why don't you specify EXACTLY WHICH medium cage RDER will work?
A 6600 lists a 27T max cog size. VERY unlikely it would even handle 32T, and 30T could be problematic.
Bill Kapaun is offline  
Old 01-23-21, 12:35 PM
  #11  
HillRider
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 32,813

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

Mentioned: 37 Post(s)
Tagged: 0 Thread(s)
Quoted: 1653 Post(s)
Likes: 0
Liked 507 Times in 384 Posts
Originally Posted by grahameinlondon View Post
Thanks so much. But I don't understand how a 9 speed derailleur will work on a 10 speed? Where can I find the pull ratio for my ST6600 shifters?
The rear derailleur doesn't know or care how many cogs you have, only how far it moves from a given cable pull. Shimano 7,8,9 and 10-speed road and 7,8 and 9-speed MTB derailleurs all use the same cable pull geometry so they will work with any Shimano 7,8,9 and 10-speed shift levers and cassettes with matching speed count. Your ST-6600 shifters are 10-speed and will work with a 10-speed cassette and any of the above compatible rear derailleur generations.

The rd compatibility breaks down at 10-speed MTB and all 11 and 12-speed components.
HillRider is offline  
Old 01-23-21, 03:39 PM
  #12  
cxwrench
Senior Member
 
cxwrench's Avatar
 
Join Date: Jul 2013
Location: Nor-Cal
Posts: 1,694

Bikes: lots

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 752 Post(s)
Liked 918 Times in 525 Posts
Originally Posted by woodcraft View Post
I have a Force 10 sp medium cage RD that absolutely works with 11/34 cassette,

and have been running short cage RD/ Road link 11/34 & 34/48 for several years without issue (there is a little slack in small/small which I never use).

Lighten up on a new poster.
No. I'll give him crap as I see fit. It's always a good thing to know your limitations and if you don't then know them someone needs to point them out. In your case the Force med cage is spec'd for a 32. Some people, like you, will get it to work. Bear in mind the big problem isn't getting the derailleur to shift into the bigger cog, it's the fact that the pulley cage will only wrap so much chain. If you add the dreaded Road Link your pulley cage doesn't magically get longer. You can shift into the 34 or 36 or whatever over-spec cassette you put on but it doesn't mean things work correctly. You can size the chain long and maybe have a little droop in the small/small, or you can size it normally and risk ripping the derailleur off in big/big. ALL modern drivetrains are engineered to work big/big so you should be able to do that w/o wrecking anything.
cxwrench is offline  
Old 01-23-21, 03:41 PM
  #13  
wgscott
Banned.
 
Join Date: Jul 2013
Location: CZU
Posts: 7,130
Mentioned: 61 Post(s)
Tagged: 0 Thread(s)
Quoted: 2366 Post(s)
Liked 2,229 Times in 1,110 Posts
What magical thinking explains my two cases?
wgscott is offline  
Old 01-23-21, 03:45 PM
  #14  
cxwrench
Senior Member
 
cxwrench's Avatar
 
Join Date: Jul 2013
Location: Nor-Cal
Posts: 1,694

Bikes: lots

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 752 Post(s)
Liked 918 Times in 525 Posts
Originally Posted by grahameinlondon View Post
Thanks so much. But I don't understand how a 9 speed derailleur will work on a 10 speed? Where can I find the pull ratio for my ST6600 shifters?
Let me explain this differently than the others have. There are no 'clicks' in a derailleur. It will move smoothly from high limit to low limit. The 'indexing' lives in the shifter.The shifter and the geometry of the derailleur determine how much it moves when the shifter pulls a set amount of cable. The nice thing about the older Shimano stuff...up to 10 speed road and up to 9 speed mtb, is that they all used the same cable pull ratio. You can mix and match any of those parts and they'll work perfectly. Mtb cable pull ratios changed at 10 speed (Dyna-Sys) and again at 11 speed (Dyna-Sys ll) and road also changed at 11 speed so you can't use any of those w/ the older 7, 8, or 9 speed derailleurs. Make sense?
cxwrench is offline  
Likes For cxwrench:
Old 01-23-21, 04:49 PM
  #15  
woodcraft
Senior Member
 
woodcraft's Avatar
 
Join Date: Apr 2012
Location: Nor Cal
Posts: 5,752
Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 1697 Post(s)
Likes: 0
Liked 757 Times in 463 Posts
Originally Posted by cxwrench View Post
No. I'll give him crap as I see fit. It's always a good thing to know your limitations and if you don't then know them someone needs to point them out. In your case the Force med cage is spec'd for a 32. Some people, like you, will get it to work. Bear in mind the big problem isn't getting the derailleur to shift into the bigger cog, it's the fact that the pulley cage will only wrap so much chain. If you add the dreaded Road Link your pulley cage doesn't magically get longer. You can shift into the 34 or 36 or whatever over-spec cassette you put on but it doesn't mean things work correctly. You can size the chain long and maybe have a little droop in the small/small, or you can size it normally and risk ripping the derailleur off in big/big. ALL modern drivetrains are engineered to work big/big so you should be able to do that w/o wrecking anything.

Someone that just joined, has 5 posts, gives better than many input, your own contribution is questionable,

and you bite his head off? Classy.
woodcraft is offline  
Likes For woodcraft:
Old 01-23-21, 05:49 PM
  #16  
Bill Kapaun
Really Old Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Posts: 12,677

Bikes: 87 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.

Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 1341 Post(s)
Liked 564 Times in 426 Posts
Originally Posted by woodcraft View Post
Someone that just joined, has 5 posts, gives better than many input, your own contribution is questionable,

and you bite his head off? Classy.
I think post #10 explains it.
Bill Kapaun is offline  
Old 01-23-21, 06:04 PM
  #17  
wgscott
Banned.
 
Join Date: Jul 2013
Location: CZU
Posts: 7,130
Mentioned: 61 Post(s)
Tagged: 0 Thread(s)
Quoted: 2366 Post(s)
Liked 2,229 Times in 1,110 Posts
For the record, 34T is in fact within spec, according to Shimano for its Tiagra rear derailleur:




However, if I was the OP (and hadn't been put off by all the hemming and hawing), I would try the Shimano Ultegra Rear Derailleur RD-6600 first, and see if a B-screw adjustment would enable a 34T to be accommodated.
wgscott is offline  
Old 01-23-21, 06:50 PM
  #18  
Bill Kapaun
Really Old Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Posts: 12,677

Bikes: 87 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.

Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 1341 Post(s)
Liked 564 Times in 426 Posts
Originally Posted by wgscott View Post
For the record, 34T is in fact within spec, according to Shimano for its Tiagra rear derailleur:

However, if I was the OP (and hadn't been put off by all the hemming and hawing), I would try the Shimano Ultegra Rear Derailleur RD-6600 first, and see if a B-screw adjustment would enable a 34T to be accommodated.
The 4700 has a different cable pull ratio.
Bill Kapaun is offline  
Old 01-23-21, 06:56 PM
  #19  
Siu Blue Wind
Homey
 
Siu Blue Wind's Avatar
 
Join Date: Apr 2005
Posts: 13,295
Mentioned: 53 Post(s)
Tagged: 0 Thread(s)
Quoted: 2044 Post(s)
Liked 654 Times in 427 Posts
Yeah being brash doesn't sit well with me..
__________________
Originally Posted by making View Post
Please dont outsmart the censor. That is a very expensive censor and every time one of you guys outsmart it it makes someone at the home office feel bad. We dont wanna do that. So dont cleverly disguise bad words.
Siu Blue Wind is offline  
Old 01-23-21, 08:48 PM
  #20  
cxwrench
Senior Member
 
cxwrench's Avatar
 
Join Date: Jul 2013
Location: Nor-Cal
Posts: 1,694

Bikes: lots

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 752 Post(s)
Liked 918 Times in 525 Posts
Originally Posted by Siu Blue Wind View Post
Yeah being brash doesn't sit well with me..
You might want to ignore list me cuz I'm pretty old and have been like this for a long time.
cxwrench is offline  
Old 01-23-21, 08:58 PM
  #21  
Homebrew01
Super Moderator
 
Homebrew01's Avatar
 
Join Date: Jul 2004
Location: Ffld Cnty Connecticut
Posts: 21,633

Bikes: Old Steelies I made, Old Cannondales

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 1054 Post(s)
Liked 467 Times in 337 Posts
Originally Posted by cxwrench View Post
You might want to ignore list me cuz I'm pretty old and have been like this for a long time.
People can change.
__________________
Bikes: Old steel race bikes, old Cannondale race bikes, less old Cannondale race bike, crappy old mtn bike.

FYI: https://www.bikeforums.net/forum-sugg...ad-please.html
Homebrew01 is offline  
Old 01-23-21, 09:11 PM
  #22  
Bill Kapaun
Really Old Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Posts: 12,677

Bikes: 87 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.

Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 1341 Post(s)
Liked 564 Times in 426 Posts
Originally Posted by cxwrench View Post
You might want to ignore list me cuz I'm pretty old and have been like this for a long time.
A moderator is more likely to remove you than ignore you.
Bill Kapaun is offline  
Old 01-23-21, 09:44 PM
  #23  
wgscott
Banned.
 
Join Date: Jul 2013
Location: CZU
Posts: 7,130
Mentioned: 61 Post(s)
Tagged: 0 Thread(s)
Quoted: 2366 Post(s)
Liked 2,229 Times in 1,110 Posts
You could also have written:

Originally Posted by Bill Kapaun View Post
Just because it doesn't work on YOUR bike with YOUR UNSPECIFIED RDER doesn't mean it won't work on someone else's bike..
The 10sp Tiagra rear derailleur will work with both road and mtn shifters, fwiw.

The assertion was
there are no 10spd road derailleur that work w/ a 34t cog.
I was simply providing a counter-example.

But the 34T will in many cases (including mine) with an Ultegra medium cage derailleur.

Even if it can't, the same information can be conveyed, possibly in a more compelling manner, if it is presented in a way that doesn't include the stuff about incompetency and not being a member of the club.

Heck, I'm a scientist with zero social skills, and even I can work that out.

Last edited by wgscott; 01-23-21 at 09:53 PM.
wgscott is offline  
Old 01-23-21, 09:47 PM
  #24  
Supercardplayer
Junior Member
 
Join Date: Jan 2021
Posts: 13

Bikes: 2006 felt f5c every thing but the frame upgraded to Ultegra hunt aero wide wheels I dose the job

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
Ok ok I have experience in this topic and was showing how I got it to work with my setup . Don't make up a story and say I said it to make me look wrong .

Last edited by Supercardplayer; 01-23-21 at 09:51 PM.
Supercardplayer is offline  
Old 01-23-21, 10:09 PM
  #25  
Supercardplayer
Junior Member
 
Join Date: Jan 2021
Posts: 13

Bikes: 2006 felt f5c every thing but the frame upgraded to Ultegra hunt aero wide wheels I dose the job

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
Originally Posted by cxwrench View Post
You might want to ignore list me cuz I'm pretty old and have been like this for a long time.
Please me nice and don't be elitist telling everyone that there wrong even if your right . These are the thing I really don't like about bike forms ,
Supercardplayer is offline  

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.