SRAM NX cassette 1x / 2x compatibility
06-10-22, 09:18 AM
#1
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SRAM NX cassette 1x / 2x compatibility
Sram sells its NX level 11 speed cassette (PG-1130) in four (edit: five) versions: 11-26t, 11-28t, 11-32t, 11-36t, 11-42t.
On the product page, it says that the "11-36t and 11-42t cassettes are compatible with 1x drivetrains only"
https://www.sram.com/en/sram/models/cs-pg-1130-a1
Can someone confirm this is the case? I don't see why this can't be a drop in replacement in a GX 2x11 system where the derailleur is designed to handle the 10-42t GX cassette, which has a wider range that the cassette in question.
On the product page, it says that the "11-36t and 11-42t cassettes are compatible with 1x drivetrains only"
https://www.sram.com/en/sram/models/cs-pg-1130-a1
Can someone confirm this is the case? I don't see why this can't be a drop in replacement in a GX 2x11 system where the derailleur is designed to handle the 10-42t GX cassette, which has a wider range that the cassette in question.
Last edited by Yan; 06-10-22 at 04:25 PM.
06-10-22, 11:47 AM
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Sram sells its NX level 11 speed cassette (PG-1130) in four versions: 11-26t, 11-28t, 11-32t, 11-36t, 11-42t.
On the product page, it says that the "11-36t and 11-42t cassettes are compatible with 1x drivetrains only"
https://www.sram.com/en/sram/models/cs-pg-1130-a1
Can someone confirm this is the case? I don't see why this can't be a drop in replacement in a GX 2x11 system where the derailleur has a 42t capacity.
On the product page, it says that the "11-36t and 11-42t cassettes are compatible with 1x drivetrains only"
https://www.sram.com/en/sram/models/cs-pg-1130-a1
Can someone confirm this is the case? I don't see why this can't be a drop in replacement in a GX 2x11 system where the derailleur has a 42t capacity.
Max chain wrap = (largest chain ring - smallest chain ring) + (largest rear cog - smallest rear cog)
In a 1X setup, the first term in the above equals 0, so max chain wrap is only determined by the second term above. Whereas, in a 2X setup, both of the above terms affect max chain wrap.
06-10-22, 11:52 AM
#3
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Which GRX RD? An RD has two limits: max cog size AND max chain wrap:
Max chain wrap = (largest chain ring - smallest chain ring) + (largest rear cog - smallest rear cog)
In a 1X setup, the first term in the above equals 0, so max chain wrap is only determined by the second term above. Whereas, in a 2X setup, both of the above terms affect max chain wrap.
Max chain wrap = (largest chain ring - smallest chain ring) + (largest rear cog - smallest rear cog)
In a 1X setup, the first term in the above equals 0, so max chain wrap is only determined by the second term above. Whereas, in a 2X setup, both of the above terms affect max chain wrap.
06-10-22, 02:51 PM
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OP posts that the cassettes are available in 4 versions...then lists 5.
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06-10-22, 03:02 PM
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06-10-22, 04:22 PM
#6
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With the cassette in my question the chain wrap is 43. So why does SRAM mark this as incompatible?
Last edited by Yan; 06-10-22 at 04:29 PM.
06-10-22, 04:36 PM
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Sram only sells a single crankset option in its GX 2x11 line: 24/36t. The GX derailleur is designed to use this crankset with a 10-42 cassette. I'm asking why SRAM marks its 11-42 cassette as 1x compatible only. The 11-42 cassette has a narrower range than SRAM's own 10-42 cassette. Any derailleur which can handle the 10-42 should be able to handle the 11-42 when using the same crankset.
What you have proposed seems logically correct, i.e., that a GX RD which can handle 36/24 chain rings with a 10-42 cassette should also be able to handle a 11-42 cassette with the same 36/24 chain rings. And maybe this is confirmed on page 7 of the SRAM 2021 MTB Components Compatibility Map (if I am reading it correctly?) here:
gen0000000006273-rev-a-2021-mtb-components-compatibility-map.pdf (sram.com)
But note that there are two versions of this RD, with long and medium cages.
GX 2x11 Rear Derailleur | RD-GX-11-A1 | SRAM
06-10-22, 04:45 PM
#8
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I see; I did not know that there is only one 2x11 GX chain ring combo or that you are using it.
What you have proposed seems logically correct, i.e., that a GX RD which can handle 36/24 chain rings with a 10-42 cassette should also be able to handle a 11-42 cassette with the same 36/24 chain rings. And maybe this is confirmed on page 7 of the SRAM 2021 MTB Components Compatibility Map (if I am reading it correctly?) here:
gen0000000006273-rev-a-2021-mtb-components-compatibility-map.pdf (sram.com)
But note that there are two versions of this RD, with long and medium cages.
GX 2x11 Rear Derailleur | RD-GX-11-A1 | SRAM
What you have proposed seems logically correct, i.e., that a GX RD which can handle 36/24 chain rings with a 10-42 cassette should also be able to handle a 11-42 cassette with the same 36/24 chain rings. And maybe this is confirmed on page 7 of the SRAM 2021 MTB Components Compatibility Map (if I am reading it correctly?) here:
gen0000000006273-rev-a-2021-mtb-components-compatibility-map.pdf (sram.com)
But note that there are two versions of this RD, with long and medium cages.
GX 2x11 Rear Derailleur | RD-GX-11-A1 | SRAM
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06-10-22, 04:51 PM
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