Theft prevention device for enabling to lock the handlebar grip and the brake-lever of a two-wheeled vehicle, where the brake-lever is movably connected to the handlebar, to prevent stealing of the vehicle. The device may comprise a housing comprising at least two openings; a handlebar cuff that enables slidably attaching to the housing through the openings and cuffing of the handlebar grip therein; a brake-lever cuff that enables slidably attaching to the housing through the openings and, cuffing of the brake-lever therein; and a lock assembly that is operatively associated with the cuffs. The lock assembly enables locking the cuffs in a position where the cuffs cuff the handlebar grip and the brake-lever. To install the theft prevention device the cuffs should be approximate to one another, and then the user may lock the cuffs in the approximated cuffing position, using the lock assembly.