This document describes the design and development of an advanced bike security system using GSM and GPS technologies. The system is intended to prevent bike theft by tracking the location of a stolen bike and allowing the owner to remotely lock the engine. It consists of a microcontroller interfaced with a GSM module and GPS receiver. When a theft occurs, the GPS module sends the bike's coordinates via SMS to the owner's phone. The owner can then send a message to lock the engine. The system provides bike tracking, theft notification, and remote immobilization in a simple, low-cost package.