I currently have a 3x9 Shimano drivetrain, and I'd like to replace the current Shimano 9-speed rear derailleur/shifter/cassette and front derailleur/3 chainrings with the SRAM PG-1170 11-32T cassette, NX rear derailleur, GX shifter, and a narrow wide chainring.
As I understand, 11-speed SRAM cassettes that use an 11 tooth small cog do not require the XD driver body. Additionally, SRAM 11T and Shimano MTB 11-speed cassettes are cross-compatible with Shimano and SRAM derailleurs/shifters. And Shimano 11-speed MTB cassettes fit onto 8/9/10 speed hubs, but Shimano 11-speed road cassettes do not.
The SRAM PG-1170 cassette is listed as a 'road cassette.' The REI description for the PG-1170 lists 'Shimano HG/SRAM PG' Freehub compatibility.
Is my understanding correct, and would this 1x11 upgrade be as straightforward as replacing the existing Shimano components with the SRAM components described above?