Mountain Bike Reviews Forum banner
1 - 12 of 12 Posts

·
Registered
Joined
·
311 Posts
Discussion Starter · #1 ·
I am wondering...if the 10 spd cassette fits where the 9 spd was, and the shifters are what indexes the derailleur, and I have 10 spd XX shifters, wouldn't any sram 9 speed rear derailleur work? I am assuming the high and low stops can be adjusted to the cassette, and the shifters are what controls where the derailleur goes...then either I'm right or I'm missing something.
 

·
Premium Member
Joined
·
48,238 Posts
sachase said:
I am wondering...if the 10 spd cassette fits where the 9 spd was, and the shifters are what indexes the derailleur, and I have 10 spd XX shifters, wouldn't any sram 9 speed rear derailleur work? I am assuming the high and low stops can be adjusted to the cassette, and the shifters are what controls where the derailleur goes...then either I'm right or I'm missing something.
No, the 9-speed RDs are not compatible with 10-speed shifters, SRAM or Shimano.
 

·
Registered
Joined
·
311 Posts
Discussion Starter · #3 ·
Yes, Mr. SuperModerator, but why? Because Sram says so?
 

·
Premium Member
Joined
·
48,238 Posts
sachase said:
Yes, Mr. SuperModerator, but why? Because Sram says so?
*sigh*

NO! Because the 10-speed RDs use different geometry than the 9-speed RDs. The RDs move a different amount for the same amount of cable travel.

Same reason you can not use a SRAM RD with a Shimano shifter.

The exception is Shimano 9-speed RDs will work with Shimano 10-speed road shifters. They have changed the geometry for the mtb 10-speed so they are not interchangeable.
 

·
Premium Member
Joined
·
48,238 Posts
morganfletcher said:
This is interesting.

Morgan
Old news. Travis Brown did that a Leadville last year.

If you really want to mess around, if you hookup a Campy 10-speed road shifter to a Shimano (7-,:cool: 9-speed RD it will shift perfectly on an 8-speed Shimano/SRAM cassette.
 

·
Registered
Joined
·
311 Posts
Discussion Starter · #8 ·
cool thanks for the explanation.
 

·
Registered
Joined
·
311 Posts
Discussion Starter · #10 ·
so if I have to get a 10 spd rear derailleur, should I get the med cage for my 2x10 set up?

chainrings 26/39
cassette 12-36
 

·
caffeine dependent
Joined
·
186 Posts

·
Registered
Joined
·
311 Posts
Discussion Starter · #12 ·
cool, thats what I needed to know.
 
1 - 12 of 12 Posts
Top