Bike theft is common in cities, and e-bikes are attractive targets. No lock is unbreakable, but the right lock used correctly makes your bike a much harder target than the bikes around it — which is often enough.
Key Takeaways
- Hardened steel U-locks and heavy chains offer much better protection than cable locks.
- Independent ratings such as Sold Secure and ART help compare lock strength.
- Lock the frame to a solid, fixed object, keep the lock off the ground, and fill the lock’s space.
- For expensive bikes, use two different lock types, register the bike, and consider insurance.
Lock types
Cable locks. Lightweight and cheap but easily cut. Best only as a secondary lock for wheels or accessories.
U-locks (D-locks). Hardened steel shackles that resist cutting and leverage. A good U-lock is the standard choice for city commuting.
Chain locks. Heavy hardened chains with a strong padlock. Flexible for locking to awkward objects, but heavy.
Folding locks. Linked steel plates that fold compactly. Security varies by model.
Angle-grinder-resistant locks. Newer locks designed to slow battery-powered grinders. Heavier and more expensive, but worth considering for high-value bikes in high-theft areas.
Security ratings
Independent testing organisations rate locks:
- Sold Secure (UK) uses bronze, silver, gold and diamond ratings for bicycles.
- ART (Netherlands) uses a star rating.
Manufacturer-only ratings are not standardised. Prefer locks with independent ratings, and match the rating to your bike’s value and theft risk.
Locking technique
How you lock matters as much as which lock you use:
- Lock to something solid — a properly anchored bike rack or post that cannot be lifted or cut.
- Lock the frame, not just a wheel.
- Keep the lock off the ground, where it can be smashed or levered.
- Fill the lock space. A U-lock with little room inside is harder to attack with leverage.
- Secure wheels with a second lock or locking skewers.
- Choose busy, well-lit spots with cameras or foot traffic.
- Remove accessories such as lights, bags and, on e-bikes, displays or batteries if removable.
E-bike extras
- Remove the battery when possible; it is expensive and often stolen.
- Use two locks of different types, so thieves need two tools.
- Use GPS trackers hidden in the frame or accessories.
- Store indoors overnight.
Register and record
- Record your serial number (usually under the bottom bracket) and keep photos.
- Register your bike with a bike registry or local police program where available.
- Keep receipts for insurance claims.
Insurance
Some homeowners and renters policies cover bicycles, often with limits or deductibles. Specialist bike insurance may cover theft away from home, damage and liability. Check coverage before relying on it.
Frequently Asked Questions
How much should I spend on a lock? A common guideline is around 10% of the bike’s value, more for high-theft areas.
Is one lock enough? For short stops in low-risk areas, a good U-lock may be enough. For longer stays or expensive bikes, use two.
Where should I never lock my bike? To flimsy signs, small trees, railings that can be cut, or anything a bike can be lifted over.
Can thieves pick locks? Cheap locks can be picked. Better locks use higher-security cylinders.
The bottom line
Use a strong, independently rated lock, lock the frame to something solid, fill the lock space and avoid leaving valuables. For expensive bikes, add a second lock, registration and insurance.