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LockNRoll patented system makes safe the saddle and the wheels.The principle is easy: its a keyless system, no tool required.When the bike is in the usual position (wheels down), LockNRoll is in the locked state: a mobile axle inside the device prevents it from opening. To unlock, simply turn the bike upside down. When the bike passes the vertical position, the axle falls down releasing the risk of opening the lever. The LockNRoll releases are assembled exactly the same way you install traditional quick releases. We recommend a strong tightening so that no one can make the quick-release revolve around its axis (thus unlocking the device).