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Sram 10 speed rear derailleur....

Old 03-02-14, 06:46 PM
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A Pile of Tile
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Sram 10 speed rear derailleur....

So I purchased a new White X9 Rear derailleur for my wifes bike.....but kinda missed the point that it was a 10 speed. The bike has a 9 Speed Sram Cassette, 9 Speed Sram Chain & 9 Speed Sram 1:1 Shifters. Will this all still work? Can I set the low limit screw to omit the "10th" gear?

Has anyone ever done this? How does it work?
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Old 03-02-14, 08:48 PM
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If you already have 9s Sram levers, you're OK. The indexing is controlled by the lever, not the RD. As long as the cable response ratio (RD movement compared to cable movement) is the same the RD will simply become a 9s.

The idler cage is also a hair narrower, but I've never seen this become an issue.

OTOH, if you bought a derailleur and levers you're SOL, becuae 10s spacing is roughly 10% narrower. On the bright side 10s and 9s cassettes fit the same hubs, so adding a cassette would complete the conversion to 10s.
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Old 03-02-14, 08:54 PM
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Originally Posted by FBinNY View Post
If you already have 9s Sram levers, you're OK. The indexing is controlled by the lever, not the RD. As long as the cable response ratio (RD movement compared to cable movement) is the same the RD will simply become a 9s.

The idler cage is also a hair narrower, but I've never seen this become an issue.

OTOH, if you bought a derailleur and levers you're SOL, becuae 10s spacing is roughly 10% narrower. On the bright side 10s and 9s cassettes fit the same hubs, so adding a cassette would complete the conversion to 10s.
Thanks...that's kind of what I thought. The shifters are 3 x 9, Cassette and chain are also 9 speed, just missed the 10speed on the rear mech. Thanks.
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Old 03-02-14, 09:49 PM
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Originally Posted by A Pile of Tile View Post
So I purchased a new White X9 Rear derailleur for my wifes bike.....but kinda missed the point that it was a 10 speed. The bike has a 9 Speed Sram Cassette, 9 Speed Sram Chain & 9 Speed Sram 1:1 Shifters. Will this all still work? Can I set the low limit screw to omit the "10th" gear?

Has anyone ever done this? How does it work?
SRAM has 2 versions of the X9 derailleur.
The SRAM X9 10-speed-specific derailleur will not work properly with 9-speed shifters and cassette. It is indeed 10-speed specific. This is why they make two versions. It's not a matter of traditional thinking that if it has SRAM's 1:1 actuation ratio , it will work with all 1:1 ratio shifters or a matter of Shimano being different than SRAM. SRAM uses two confusing terms-"1:1 Actuation" and "Exact Actuation". The terms are not interchangeable. Here's an explanation from another forum.
https://singletrackworld.com/forum/to...cheap-10-speed
"Now the mech can be designed to (within reason) move any distance for a given amount cable pull. It could, in theory at least, be designed to move across the entire cassette with the cable pull from 1 click of a shifter, or it could be set up to move 1 tenth or 1 ninth of the distance per click. The reason 9 and 10 speed are not compatible is that the mechs are designed to move a different distance "per click". You could put a 9 speed mech on but 1 click of the shift wouldn't move it the correct amount to change cog (it may be to much, it may be to little, I don't know, but it would not be right"
I myself made the mistake of installing an X9 10-speed specific derailleur as a replacement on a bike with 9-speed SRAM shifters. The bike would not shift properly. It exibited the symptoms of a bike with a bent derailleur hanger, kink in cable, or weakened derailleur spring. It shifted fine in 5 smallest cogs, then shifted poorly in last 4 largest cogs. I adjusted it so it shifted fine in the 5 largest cogs and it would shift poorly in the 4 smallest cogs. I finally noticed the "10-speed" logo on the derailleur and asked the head mechanic if this was the issue and he confirmed it. I installed the 9-speed version and it shifted perfectly.
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