Zigo Leader X2 Carrier Bike (7 Spd) he LeaderLink System allows the Leader to uncouple in 30 seconds or less, transforming the Stroller Bike it into the separate elements, Zigo ChildPod and Zigo Cycle All aluminum ChildPod and Zigo Cycle frame 7-speed Shimano Nexus hub in rear Zigo Cycle wheel Adjustable handlebar with jogging / parking brake handle Meets or exceeds ASTM standards.