10 speed shifters with 9 speed mtb derailleur
08-10-20, 01:39 PM
#1
Newbie
Thread Starter
Join Date: Jul 2020
Posts: 24
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
Likes: 0
Liked 3 Times
in
1 Post
10 speed shifters with 9 speed mtb derailleur
I’m sure this has been answered somewhere in the forums at some point in time. I have a pair of ultegra st-6600 shifters and am looking to use them with a 9 speed mtb derailleur. Hoping to put an 11-34 or 11-36 on the rear. Anyone have any ideas as to what Specific derailleur and cassette I will need (looking to spend somewhere around $40-$70 on derailleur and $60 max on cassette)? I have a single 40t chainring up front. Any help will be greatly appreciated!
08-10-20, 02:11 PM
#2
Expired Member
Join Date: Jun 2007
Location: TN
Posts: 11,493
Mentioned: 37 Post(s)
Tagged: 0 Thread(s)
Quoted: 3646 Post(s)
Liked 5,378 Times
in
2,730 Posts
This Deore M591 seems to be what is still readily available. https://www.universalcycles.com/shop...70&category=72. Max cog is 34T. Here's a good price on an LX cassette. https://www.universalcycles.com/shop...1&category=534
08-10-20, 04:06 PM
#3
Newbie
Thread Starter
Join Date: Jul 2020
Posts: 24
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
Likes: 0
Liked 3 Times
in
1 Post
I have found a good deal on an XTR RD-M952 Long cage and it’s before dynasys and shadow clutch. Does anyone know if this will work with my ultegra st 6600 levers and an 11-36 cassette?
08-10-20, 04:17 PM
#4
Expired Member
Join Date: Jun 2007
Location: TN
Posts: 11,493
Mentioned: 37 Post(s)
Tagged: 0 Thread(s)
Quoted: 3646 Post(s)
Liked 5,378 Times
in
2,730 Posts
AFAIK none of the 9 speeds were rated above 34T. That doesn't mean you couldn't use a 36T in your application. It would be trial and error.
08-10-20, 04:22 PM
#6
Expired Member
Join Date: Jun 2007
Location: TN
Posts: 11,493
Mentioned: 37 Post(s)
Tagged: 0 Thread(s)
Quoted: 3646 Post(s)
Liked 5,378 Times
in
2,730 Posts
Yes. Any 9 speed MTB rear derailleur will work with your 6600 shifters. You can also be confidant it will work with a 34T cassette.
08-11-20, 02:58 PM
#8
Senior Member
Join Date: Jul 2020
Location: Humboldt County, CA
Posts: 832
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 405 Post(s)
Likes: 0
Liked 430 Times
in
286 Posts
I've never tried this particular combination, but I've never had a problem exceeding the "max cog" specification of a rear derailleur by two or three teeth, and I've done it a bunch of times. Sometimes you have to crank the B-screw all the way down, if you're going for maximum clearance or the derailleur hanger is on the short side.
_
Downshifting onto the larger cog is supposed to be marginally slower, and less likely to work under heavy pedaling. Since I won't do that even if my drivetrain will let me, I don't see this as a big downside. And I've never been able to notice a difference anyway. Every bike I've done this to has shifted equally well before and after.
Try it... I think it'll work.
--Shannon
_
(And, no, they're not all the same length, and every manufacturer will tell you, with full documentation and a clear conscience, why theirs is the ideal length. Standardized dimensions? On a bicycle? Up with that we shall not put.)
_Downshifting onto the larger cog is supposed to be marginally slower, and less likely to work under heavy pedaling. Since I won't do that even if my drivetrain will let me, I don't see this as a big downside. And I've never been able to notice a difference anyway. Every bike I've done this to has shifted equally well before and after.
Try it... I think it'll work.
--Shannon
08-11-20, 10:34 PM
#9
Senior Member
Join Date: Feb 2015
Location: Mission Viejo
Posts: 5,800
Bikes: 1986 Cannondale SR400 (Flat bar commuter), 1988 Cannondale Criterium XTR, 1992 Serotta T-Max, 1995 Trek 970
Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 1942 Post(s)
Liked 2,162 Times
in
1,321 Posts
08-12-20, 08:56 PM
#10
Not lost wanderer.
Join Date: Jan 2013
Location: Lititz, Pa
Posts: 3,319
Bikes: In USA; 73 Raleigh Super Course dingle speed, 72 Raleigh Gran Sport SS, 72 Geoffry Butler, 81 Centurion Pro-Tour, 74 Gugie Grandier Sportier
Mentioned: 72 Post(s)
Tagged: 0 Thread(s)
Quoted: 885 Post(s)
Liked 985 Times
in
518 Posts
I am using both 105 and Ultegra GS rear derailleurs with 10 speed brifters and 11x36 on 3 different bikes.
Likes For bwilli88:
08-14-20, 06:12 AM
#11
Senior Member
I used to run a 9-speed derailleur on my X-Caliber 29er, which had a 11-36 10-speed cassette, because no one made a low-normal 10 speed derailleur. Not sure if that's changed since then, but probably not. In any case, I had to get a Tiagra flat bar road shifter because the 10 speed mountain shifters used a different pull ratio. Didn't have any issues with the 9-speed derailleur and 11-36 cassette.
