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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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PhilDAS in reply to @frankenbike

But GX 11 speed says X actuation right. Not the same as exact actuation?

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frankenbike in reply to @PhilDAS

Yeah it's fucking stupid, X-Actuation is different to Exact Actuation even though the name is almost the same. You need either a 10-speed MTB derailleur or 10/11-speed road derailleur. That 2x10 GX will be fine, it's just a question of whether or not you want that X-Horizon shit - I wouldn't bother with it to be honest, just limits your options down the line if you decide to switch to a front derailleur. But the performance might be ever so slightly better for 1x with X-Horizon.

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