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-   -   Which SRAM RD for 10sp and 11-34? (http://www.bikeforums.net/road-cycling/938112-sram-rd-10sp-11-34-a.html)

banerjek 03-13-14 02:48 PM

Which SRAM RD for 10sp and 11-34?
 
I have an 11-34 sitting around doing nothing -- got it some years ago to help me when climbing all day. I'd like to mount this on my steel bike when I'm lugging gear, but the road derailleurs only accommodate up to 32 teeth.

I'd like to pop in an MTB RD but am unclear on their pull ratios. Can I pop in any of their 9 or 10sp RD's and expect it to work?

bobonker 03-13-14 02:52 PM

You can run a SRAM medium cage road derailleur with the 11-34 cassette and it will work unless you have a really short derailleur hangar. You'll likely need the B screw turned all the way in. My wife's bike has Rival on it with the med cage rear der and a Shimano 11-34 cassette (Specialized Ruby). The chain looks a bit droopy in the small-small combo but that's not used much and it's sized for her to be able to go big-big if needed.

Bob

fstshrk 03-13-14 04:24 PM

Or use the SRAM MTB RDs (10 speed).

MikeyBoyAz 03-13-14 04:29 PM

I remembered that all SRAM had the same 1:1 pull MTB to ROAD, can anyone else confirm/deny?

rpenmanparker 03-13-14 04:29 PM

I have run a Deore RD on a road bike for extra climbing capability. Ultegra levers handled it fine since they were from comparable time period. You just have to select the right pull direction derailleur for road levers (I forget which you need). MTB RDs come either top or bottom pull while road RDs oy come one way.

MikeyBoyAz 03-13-14 04:38 PM

Quote:

Originally Posted by rpenmanparker (Post 16575379)
I have run a Deore RD on a road bike for extra climbing capability. Ultegra levers handled it fine since they were from comparable time period. You just have to select the right pull direction derailleur for road levers (I forget which you need). MTB RDs come either top or bottom pull while road RDs oy come one way.


I thought that anomalous year of shifter was only for the FD and died out shortly after...

I was under the impression RD always pulls up the cassette (larger cogs) for 10spd for both shimano and sram; mtb and road.

fstshrk 03-13-14 04:40 PM

Quote:

Originally Posted by MikeyBoyAz (Post 16575378)
I remembered that all SRAM had the same 1:1 pull MTB to ROAD, can anyone else confirm/deny?

I believe this to be true as well. Just buy the RD from a place that allows returns. In case it does not work, you can always return it.

I <3 Robots 03-13-14 05:21 PM

David Millar used a SRAM XX rear derailleur and a 11-36 cassette for the 2011 Giro.

http://road.cc/content/news/36222-gi...r-goes-all-mtb

http://farm3.static.flickr.com/2270/...58b40f55ed.jpg

TrojanHorse 03-13-14 05:56 PM

SUPPOSEDLY the road wifli RDs handle up to 32 but chances are you could get it working on a 34.

If you've already got it, I'd definitely give it a whirl before spending money on a MTB RD.

Werkin 03-13-14 06:15 PM

Quote:

Originally Posted by banerjek (Post 16575159)
...I'd like to pop in an MTB RD but am unclear on their pull ratios. Can I pop in any of their 9 or 10sp RD's and expect it to work?

Quote:

Originally Posted by MikeyBoyAz (Post 16575378)
I remembered that all SRAM had the same 1:1 pull MTB to ROAD, can anyone else confirm/deny?

Another compatibility confirmation here for 10 speed MTB RDs. I've used the X9 Type II, and currently use the XX rear derailleurs with Force 10 speed shifters. FYI, the Type II medium cage has 35T chain wrap capacity, and the non-clutch medium cage RDs 37T.

bt 03-13-14 06:27 PM

Quote:

Originally Posted by rpenmanparker (Post 16575379)
I have run a Deore RD on a road bike for extra climbing capability. Ultegra levers handled it fine since they were from comparable time period. You just have to select the right pull direction derailleur for road levers (I forget which you need). MTB RDs come either top or bottom pull while road RDs oy come one way.


wow

Dean V 03-13-14 08:11 PM

What shifters? You can use campagnolo 10sp shifters with a Sram Exact Actuation derailleur and shimano 10sp cassette. Shimano shifters need a a 9sp shimano mtb derailleur.
Don't know about sram road levers.

link0 03-13-14 08:38 PM

Any SRAM mid cage (Wi-Fli) road rear derailleur can do 34T. They are designed for 32T, so making a small B-screw adjustment to fit 34T is nothing.

MileHighMark 03-14-14 09:54 AM

SRAM's road and mtb 10s stuff has the same cable pull, so you can run road levers/shifters with an mtb rear mech to get gobs of chain wrap/capacity.

Psimet2001 03-14-14 10:07 AM

SRAM mtb and road stuff is indeed the same pull. We have been using a lot of their 10 and 11 spd derails with road levers for killer 1x cross setups mainly starting last year.

You can get a medium cage road derail in their lineup to swing that 34 as well if you need to.

Psimet2001 03-14-14 10:10 AM

Quote:

Originally Posted by rpenmanparker (Post 16575379)
I have run a Deore RD on a road bike for extra climbing capability. Ultegra levers handled it fine since they were from comparable time period. You just have to select the right pull direction derailleur for road levers (I forget which you need). MTB RDs come either top or bottom pull while road RDs oy come one way.

+1 - I ran Deore XT rear derails on my cross rigs when I was running Dura-Ace 7800 levers. It has become more muddied as Shimano started changing pull ratios, came out with Dyna-sys (huge pull for lever throw), and they have experimented/changed ratios in some of the latest Ultegra and DA mechanical applications. It's not as easy as it used to be.

+1 for Mtb top or bottom RDs. Also FDs for cross applications and mtb can be top or bottom pull so you need to know what you're looking for.

fstshrk 03-14-14 06:22 PM

Quote:

Originally Posted by Psimet2001 (Post 16577311)
+1 - I ran Deore XT rear derails on my cross rigs when I was running Dura-Ace 7800 levers. It has become more muddied as Shimano started changing pull ratios, came out with Dyna-sys (huge pull for lever throw), and they have experimented/changed ratios in some of the latest Ultegra and DA mechanical applications. It's not as easy as it used to be.

+1 for Mtb top or bottom RDs. Also FDs for cross applications and mtb can be top or bottom pull so you need to know what you're looking for.

+2 ...

I have a Deore XT RD on my touring bike and it works fine a triple crankset and 11-34 rear cassette.


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