How to choose and use a bike lock

Lock types

A second lock of a different type can force a thief to use more than one tool. That can be worthwhile for higher-value bikes or predictable all-day parking.

• D-lock: strong and relatively portable
• Chain: flexible around awkward stands but heavy
• Folding lock: compact with variable security
• Cable: useful as a secondary wheel restraint, not primary high-risk security

A better locking method

1. 1

   Choose a busy, well-lit stand fixed securely to the ground.

2. 2

   Lock the frame, not only a wheel.

3. 3

   Fill unused space inside the lock to reduce leverage.

4. 4

   Keep the lock away from the ground where it is harder to strike.

5. 5

   Secure quick-release wheels and remove easily detached accessories.

Ratings and policy requirements

Independent security ratings are useful, but product ratings can change and insurers may specify an exact level. Confirm the current product listing and your policy wording before purchase.

Use several layers of risk reduction

Roadworthy brakes, secure wheels, observation, a suitable route and predictable positioning work together. Clothing, reflective details and a helmet may be part of a rider's personal strategy, but none replaces a mechanically sound bicycle or attention to the road environment.

Check the current Highway Code and lighting requirements rather than relying on an old summary. Conditions change by time of day, traffic level and weather, so a route that feels comfortable in daylight may need a different alternative after dark.

Prepare for foreseeable problems

Tell someone the route for an unfamiliar or longer ride, keep a charged phone and carry tools only when they fit the bicycle and you know how to use them. Slow down for poor visibility, wet surfaces, pedestrians, horses and junctions where another road user may not have seen you.

After a near miss or equipment problem, review what happened without assuming a single cause. A route change, earlier signal, different road position, service or additional light may each address a different part of the risk.