SRAM developed their X-Range drivetrain concept to integrate the new shifting parameters of the 12-speed eTap AXS system, whether running a 1x12 or 2x12 set-up. Every piece, from the chainrings, chain, and cassette through the electronic precision of the AXS wireless shifting protocol and the required derailleurs have been set-up to fully optimize the new chainring options with the Force XG-1270 X-Range 12 Speed cassette. The brains of eTap AXS identify the proper shift windows and gates based on gearing and set-up, the new Flattop chain was developed for the X-range teeth profiles, all to make the most precise, perfectly timed and super smooth shift.

The MINI CLUSTER™ construction of the Force-level cassette reduces weight and increases durability, while keeping the unit, light, strong, and resilient to severe chainline stress- without breaking the bank with the XG-1290 Red-level version. The unit is not just about light weight and strength, but about X-Range. The more gradual gear progression between cogs, with at least five 1-tooth jumps makes for smoother, faster, more precise shifts. Of course X-Range relies on a 10T small cog to best match the Force AXS chainring offerings, which necessitates the need for a SRAM XDR driver for the rear hub. XDR was designed specifically for SRAM road 12-speed cassettes.

The XDR interface is 1.85mm longer than XD and is designed for road hub applications. XDR maintains the same hub spacing and flange locations used for 11-speed road compatible HyperGlide (Shimano standard) freehub bodies. XDR driver bodies are compatible with all mountain XD cassettes when the cassette is installed with a 1.85mm spacer behind it. Many hub and wheel systems offer XDR freehub body options as SRAM has licensed it to more than 80 wheel and hub manufacturers.... Read More