<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
Can you tell me what bike locks offer the best protection against theft?
<|assistant|>
U-locks offer the best level of protection against bike theft, as they create a strong physical barrier around your bike to prevent it from being taken. A good-quality U-lock should be at least twice as long as your bike, and thick enough that it can't be snapped in half by a would-be thief. Additionally, some U-locks include built-in tamper alerts, which can let you know if someone has tampered with the lock.