How to properly lock your bicycle

This guide will help you quickly improve your bike security and reduce the risk of theft—whatever you ride, wherever you lock it.

What's the best way to lock a bicycle?

Secure the frame and at least one wheel to a fixed object using a high-quality lock. This prevents the bike being ridden away, carried off, or quickly dismantled. Do this properly and most thieves will move on. Job done.

Bike security isn't just about buying the most expensive lock. It comes down to five practical elements:

1. What you lock your bike with
2. What you lock it to
3. Where you lock your bike
4. How you lock it
5. What you're locking up

Think about those five factors, implement the ones you can and you'll dramatically reduce the risk of your bicycle being stolen.

1. What You Lock It With

Use a high-quality D-lock

• Sold Secure rated
• Thick shackle
• Double-locking (must be cut twice, doubling attack time)

That’s your baseline.

Never use a cable — it can be cut in seconds

Go 16mm+ shackle thickness — resists standard bolt croppers

Don’t skimp — a quality D-lock starts at ~£50 - far less than the cost and hassle of a theft

Match the crowd — don’t have the weakest lock on the rack

Ignore “percentage of bike value” rules. Thieves don’t think in ratios—they assess effort and risk. A £300 bike in a quiet spot can be an easier target than a £2,000 bike in full view.

Save £40 on your lock now and you'll likely pay for it later.

A good example is the Pragmasis DIB D-lock—Sold Secure Gold rated, with a 16mm shackle and double-locking mechanism, available in multiple sizes.

2. What You Lock It To

A Gold-rated lock is pointless if you attach it to something that can be cut or lifted.

Look for something solid, fixed and ideally embedded in concrete. Purpose-built cycle stands are best. The most common and reliable design is the Sheffield stand - a simple U-shaped steel bar fixed into the ground. It allows you to secure the frame and at least one wheel properly.

Railings can work, but thin ones are easily cut. Street signs are acceptable for short stops, but check it's securely in the ground - many are loose. 

Before locking up, take a few seconds to check what you're attaching to. Is it firmly fixed? Could it be unbolted? Could the bike simply be lifted over it?

Park in the middle of a rack when possible. Being partially obscured by other bikes makes yours less immediately visible from a distance.

3. Where You Lock Your Bike

Theft prevention starts before you even reach for your lock. The most overlooked factor in bike security is location. 

The key principle is simple: don't let a thief operate unseen.

I would never lock a bike in the depths of a shopping centre car park, near loading bays or bins. I would rather lock it directly outside the main entrance where there is foot traffic, visibility, and ideally CCTV.

Busy areas deter opportunists. Lighting matters at night. And it helps if your bike isn't the only one there; thieves prefer isolation, not attention.

One thing I avoid entirely is so-called "secure" car parks. They feel safe, but they're often dimly lit, tucked away, and poorly supervised. Bike racks are usually positioned in quiet corners. Thieves know this, and they also know that people tend to relax their security in places people think are "secure".

4. How You Lock It

How you use your lock matters as much as what you buy.

Always secure the frame and immobilise the rear wheel where possible. Locking only a front wheel is an invitation for a thief to detach the wheel and walk away with the rest of the bike, so you must lock the frame.

If you only lock the frame, a thief could cut what you’ve locked it to and ride away. Immobilising a wheel forces them to attack the lock itself—typically requiring two cuts.

Position the lock so it is off the ground. If it rests on the pavement, it can be braced and struck more effectively with tools. Height reduces leverage.

Avoid locking around the top tube if possible. It can provide a stable platform for tools such as grinders.

If you're using a D-lock, fill as much of the internal space as possible with frame and wheel. Excess empty space makes it easier to get a bar in there to twist or pry the lock.

If you're using a chain, don't leave long lengths hanging loose. wrap slack tightly around the frame to prevent leverage attacks.

Combining a bicycle chain lock with a D-lock provides both flexibility and strong resistance to attack. When I leave my bike in town for longer stops, I use a heavy-duty primary lock on the frame and rear wheel, and a secondary lock through the frame. It's not theft-proof - nothing is - but it increases the time, tools and attention required.

Thieves prefer quick wins. Your goal is not invincibility; it's inconvenience.

5. What You're Locking Up

Not all bikes carry the same risk.

High-value e-bikes, race bikes and certain brands are particularly attractive. In cities like London, folding bikes such as Brompton are known targets because they are easy to transport and sell.

Professional thieves are not guessing. They know what sells quickly. They consider:

• How easy the bike is to remove
• How visible they are while doing it
• How much they'll get for it
• How quickly they can move it on

If you own a high-value bike but frequently park it in public, it may be worth considering a secondary, less conspicuous bike for short trips. A modest "town bike" is often less attractive and far less painful to lose.

Locking Technique Matters More Than Lock Price

A modest lock used well is far more effective than an expensive one used poorly.

Conversely, even an expensive lock can be defeated quickly or bypassed, if used poorly.

Where should you lock a bicycle in the city?

When locking a bicycle in a city centre, visibility is one of the most important deterrents. Busy streets, shopfronts and areas with heavy pedestrian traffic are far safer than quiet side streets or hidden corners.

Bike security works in layers:

• Choose a visible location
• Lock to something immovable
• Use a rated lock you will carry daily
• Secure the frame and rear wheel where possible
• Consider using two locks for longer stops

Do those things consistently and you will dramatically improve your real-world security.

Nothing is theft-proof. Most thieves are looking for the easiest option, not the hardest challenge.

Your aim is simple: make your bike the wrong choice.