Can I use other SRAM 1x11 derailleurs with 12-speed Eagle™ cassette? What Eagle™ parts are cross compatible with existing 11-speed SRAM components? Since the cable pull ratio is the same (X-Actuation) I should be able to use 11-speed X01 or XX1 parts with 12-speed X01 and XX1 Eagle™ parts right? Is the throw (distance) per shift different? The 11-tooth cog--like the 11 speed versions--will "fit into" the 12-tooth cog slightly. The SRAM measures 1.631" from outside-to-outside, so it is a hair wider than the Campagnolo. The cogs are slightly wider at 0.070 for the 28-tooth aluminum gear to 0.062 for the steel ones. IIRC Campagnolo recommend a 29 tooth max but I use a Shimano 11-30 on the turbo. Using Athena 11 speed though but I think you’d be okay. PS - Either go all in 10 speed or 11 speed. Don't mix and match.