1. Choose the Right Lock: Invest in a high-quality U-lock, chain lock, or folding lock from a reputable brand. Ensure it’s appropriate for the level of security you need.
2. Lock Both Wheels and Frame: Lock your bike frame and both wheels to a secure object. If that’s not possible, at least secure the frame and rear wheel.
3. Lock to a Fixed Object: Use a sturdy bike rack, a post, or another immovable object. Avoid trees, flimsy fences, or anything that can be easily cut.
4. Secure High-Traffic Areas: Park your bike in well-lit, busy areas with foot traffic. Thieves are less likely to operate where they might be seen.
5. Lock at Home: Even at home, use a lock to secure your bike. Many thefts happen from garages or yards.
6. Use Two Locks: If possible, use two different types of locks. For instance, a U-lock and a cable lock. This deters thieves who might specialize in one type of lock.
7. Lock Rear Wheel and Frame First: Start by securing your rear wheel and bike frame to the fixed object. This is more difficult to remove compared to the front wheel.
8. Lock the Front Wheel: Use a secondary lock to secure the front wheel and any accessories (lights, saddle, etc.) to the frame or rear wheel.
9. Minimize Gap: Ensure there’s minimal space within the lock to prevent thieves from inserting tools.
10. Lock Height: Place the lock high off the ground to prevent thieves from using the ground for leverage.
11. Face Lock Keyhole Down: Position the lock keyhole facing downward to make it harder for thieves to pick or tamper with it.
12. Fill Empty Spaces: Avoid creating large gaps between the lock and your bike.
13. Remove Valuables: Take detachable accessories and valuables with you, even if you’re using a secure lock.
14. Lock Maintenance: Keep your lock clean and lubricated. Wipe off dirt and debris regularly and use lock-specific lubricant to keep the mechanism smooth.
15. Check Before Leaving: Double-check your lock before leaving your bike. Ensure you’ve secured all parts properly.
16. Consider Security Bolts: Use security bolts for components that can be easily removed, like the saddle or handlebars.
17. Register Your Bike and Lock: Register your bike’s serial number and your lock’s information. This can help recover your bike if it’s stolen.
18. Vary Your Routine: If you often park your bike in the same place, try to vary your routine. Thieves might be monitoring patterns.

Remember, no lock is entirely theft-proof, but using proper locking techniques and high-quality locks greatly reduce the risk of your bike being stolen.