A modular bike lock includes a locking mechanism and a securement mechanism coupled with the locking mechanism. The securement mechanism wraps around at least a portion of a bicycle and includes a locking end configured to engage with the locking mechanism to lock the bike lock. The bike lock includes a wireless communications interface and a processor that receives, using the interface, a selection from a mobile device that indicates that the mobile device has selected to use the bike lock and communicates, using the interface, a unique identifier associated with the bike lock to the mobile device, the unique identifier enabling the mobile device to unlock the bike lock. The bike lock locks automatically in response to receiving the locking end within a portion of the locking mechanism without receiving an additional input from the mobile device. The bike lock is mountable on a support structure.