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frankenbike in reply to @PhilDAS

It should work if it's Exact Actuation. Have at it, I wanted a long cage anyway and that one looks short. Note that the 1x derailleurs are a bit different (that one on eBay is 2x10) as the little pivots and cage shapes are different. The jockey wheels are offset compared to the pivot on the cage with the 1x ones which means they don't work with front derailleurs at all.

Presumably the positioning of the jockey wheels/cage on the 1x has some advantage for chain retention or something but I don't know what exactly.

So what I am saying is that it will do the job but it's slightly different to the Rival/Force 1 derailleurs, and also to the 1x11 GX/etc. derailleurs

Edit: SRAM's reasoning for the change of cage shape:

The X-HORIZON™ rear derailleur’s ‘straight parallelogram’ design limits all movement to the horizontal axis, which makes ghost shifting impossible while also reducing shift force. For quicker, more exact shifting, the large upper pulley offset design maintains a constant chain gap across all gears.

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gbj_tester in reply to @frankenbike

SRAM's reasoning

All they've done is to revert to the Lucien Juy pattern, which always worked as long as you matched the pulley cage geometry to the cassette slope and didn't mess it up by using more than one chain ring. The Suntour slant parallelogram copes well with multiple chainrings but the parallelogram slant has to match the cassette slope, which starts to become difficult when the ratio of biggest sprocket to smallest becomes as large as it is on these modern 1×11 and 1×12 systems.

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frankenbike in reply to @gbj_tester

So is there any advantage to the 1x cage over the normal cage? It doesn't seem to be worth losing flexibility in front ring(s) just to prevent ghost shifting

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