[Hawgzilla]

I have yet to see a 9 speed RD offered in the clutch design but I have to think that somebody here or somewhere has figured out how to exchange parts from a 10 speed clutch type RD onto a 9 speed RD or transformed a 10 speed clutch type RD into a 9 speed to make it work. Please tell me it's possible.

 

[Slash5]

The 10 speed Shimano Shadow plus derailleur can be made to work with a 9 speed SRAM shifter. Takes some fiddling around but will work.
2 or 3 big threads here on it with all the details.

 

[sasquatch rides a SS]

^That's about all I'm aware of as well. With 11-speed becoming so popular, 10-speed will eventually fade, as 9-speed is. Same thing is happening in the road scene, except 9-speed is nearly extinct. I've actually heard someone with 11-speed Ultegra make fun of someone with 10-speed Ultegra. :nonod:

 

[gatorgrizz27]

That's interesting, I had assumed because of SRAM's 1:1 design, any RD could work with a smaller range shifter, but not vise versa. The overall travel (L-R) has to be wide enough to cover the cassette, but I thought a lower speed shifter would simply move in larger increments.

 

[JMac47]

That's interesting, I had assumed because of SRAM's 1:1 design, any RD could work with a smaller range shifter, but not vise versa. The overall travel (L-R) has to be wide enough to cover the cassette, but I thought a lower speed shifter would simply move in larger increments.

Right. Wait! Whaaaaaat? I think I get your thinking: 8-9-10 spd cassette widths are the same so why couldn't a 10 spd derailleur swing the range governed by the 8 or 9 spd shifter over the 8 or 9 spd cogs. Not the case tho without close pull ratios. And FWIW, SRAM isn't actually 1:1. More like 1:1.18 (or vice verse) I heard. That's where the close ratio of the new(r) Shimano 10spd Shadow + Dynasis comes into play as Slash noted.

 

[bigkat273]

10 speed cassettes are actually thinner than 9 speeds. Hence the occasional need for a 1mm cassette spacer with 10 speed cassettes.

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[Slash5]

Actually now that I think of it, someone said that the cam shaped thing that guides the cable into a SRAM rear derailleur seems to be shaped differently and seems to be the difference in 9 and 10 speed derailleurs.
I saw something where they swapped the cams (said they are riveted on) and it worked 9 speed. Course you are going to have to destroy a 9 speed and 10 speed derailleur to try it. Unless you have them sitting around probably almost as cost effective to buy the shifter and cassette - and a lot safer.

 

[JMac47]

10 speed cassettes are actually thinner than 9 speeds. Hence the occasional need for a 1mm cassette spacer with 10 speed cassettes.

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Interesting. Where do the spacers get positioned?

 

[bigkat273]

Between the spline shoulder and the largest cog. If your cassette has some wiggle to it even with the lock ring torqued down the spacer fixes it.

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