"Z"-Wide Locking Ratchet Frame Hook for the Sport Rider Recumbent and Heavy Duty Sport Rider SE Recumbent Bikes Rack. The recumbent Sport Riders use wider hooks and wheel holders to allow additional space between the bikes, due to the larger seats on recumbent bikes. 

These hooks are wider than the standard Sport Rider hooks in order to allow the hook to reach the bike when they are spaced further apart on the rack.

• Used on ratchet/square vertical tubes
• Used on Z spec Sport Riders for Recumbent Bike racks: HR1000Z-R, HR1450Z-R and on the Sport Rider SE for Cargo Bikes: HR1450Z-W, HR1455Z-E-W1, HR1450Z-E-W1