The Leglock bike lock concept would be sufficient to reduce the risk of bicycle theft if you're laving your two-wheeler for a short time. This security system seems to have been designed for safer neighborhoods since the main deterrent is the inability to rotate the rear wheel.
The easy-to-use pushbike attachment is a kickstand, contributing no extra bulk to the frame of your bike and requiring no chains. While you're in motion, the metal prop is oriented upwards; after you dismount, draw the stand downwards and set the combination lock. A branching metal bar on the Leglock will become fixed between the spokes of your back wheel, making it impossible for someone to jump on and ride away.