Secure it or lose it! BildaBike offers a wide selection of locks. We offer everything from a cable lock for quick trips and thick chains and U-Locks for securing your bike in the most hazardous of city conditions. *For the most secure lock, the staff favorite is the Vault Chain Lock. In fact, we use this exact lock for our rental fleet. For a little extra security, the Secret Keeper and Usane Bolt offer unparalleled security.