Speed Lock Sprocket Hub*50mm size only Any product that saves time and completes a task with more ease and efficiency can be considered an improvement. Speed Lock has done just that. Just place the Speed Lock on the hub, align it with the ring openings, rotate counter clockwise, and tighten a single screw. The traditional way of changing sprockets is now an arduous task compared to the new Speed Lock method. Spend your time in the pits completing more tasks with the time saved using the Speed Lock hub.