SRAM sells their AXS Red and Force crank set-ups in complete and modular versions. The modular set-up allows you to customize your set-up from the start, while the complete units break down into the same set of components so you make changes moving forward. This machine aluminum Red-Force AXS Crankset Spider is the standard (non-power meter) model with a 4-arm, 107 bolt circle diameter for 1x or 2x chainrings, and the 8-bolt Direct Mount interface for attaching to the driveside crankarm.