The Ultimate downhill/BMX Clipless pedal. Atomic started from scratch using a 12mm thick BMX Spindle to prevent bending and machined the body out of 6061 T6 aluminum to handle big rock hits. The biggest feature is the feel. This pedal is designed to feel like a platform pedal. Your foot fits against the whole body, not just the pivot point in the center so the pedal has more feel and power. Cleat system is Shimano Compatible. 9/16 cranks only..