The group looks to be a companion to NX Eagle, with a lower cost crankset, shifter & rear derailleur, likely to bring the total group cost down especially for OEM bikes trying to hit a more affordable pricepoint. SX Eagle doesn’t get its own chain or cassette, instead taking those direct from the already affordable NX Eagle.
The alloy SX crankset gets a slightly simplified forging with the same style of Boost-spaced, direct-mount, stamped steel chainring as found on NX, plus the new DUB bottom bracket/axle standard. We’ve seen a range of crank lengths, but only 32T chainrings being offered.
The SX Eagle rear derailleur looks much like other SRAM X-Horozon 1x derailleurs, but like the cheaper drop bar versions, it uses a more conventional cable entry point vs. the NX’s pulley. The steel cage derailleur still gets a clutch, narrow-wide lower X-Sync pulley, and a cage lock to work with up to 50T cassettes.
The plastic shifter has a simplified clamshell construction, with a built-in band clamp meaning no Matchmaker compatibility. But does share the same X-Actuation cable pull making it work with all Eagle derailleurs, and can handle 5 upshifts at a time.
The cassette for the group is the PG-1230 12-speed 11-50T shared directly with NX Eagle meaning it will work on standard HG (Shimano-style) freewheel bodies, while giving much of the range of the more premium Eagle groupsets. The chain is also a NX Eagle part, with Eagle’s distinct Powerlock quick link.