SerialCheck

Bicycle theft is a persistent problem across Australia. According to data from state and territory police forces, tens of thousands of bikes are reported stolen every year — and many more go unreported. In cities like Melbourne, Sydney, and Brisbane, a bike is stolen roughly every twenty minutes during peak periods. Whether you commute by bike, ride for fitness, or simply enjoy a weekend cruise, the risk is real and worth taking seriously.

The good news is that a few practical steps can dramatically reduce the chance of your bike being pinched — and dramatically increase the chance of getting it back if the worst happens.

Invest in a quality lock

The single most effective thing you can do is buy a decent lock. Cheap cable locks can be cut in seconds with basic bolt cutters, so they offer almost no protection. For genuine security, consider one of these options:

U-locks (D-locks): These hardened steel locks are the gold standard. Look for brands like Kryptonite or Abus with a Sold Secure rating of Silver or Gold. A quality U-lock will cost between $60 and $150, but that is a small price compared to replacing a stolen bike.
Heavy-duty chain locks: A thick, hardened chain paired with a quality padlock offers flexibility in what you can lock to. Choose chains that are at least 10 mm thick.
Folding locks: These are a good compromise between portability and security. They pack down small enough to fit in a bag or mount to your frame.

As a general rule, plan to spend about ten per cent of your bike's value on a lock. If you ride a $2,000 bike, a $200 lock is a sensible investment.

Lock smart, not just hard

Even the best lock is only effective if you use it properly. Follow these locking guidelines:

Always lock your bike to a fixed, immovable object — a proper bike rack, a sturdy post, or a metal railing. Avoid anything that can be unbolted, lifted over, or cut through.
Lock through the frame and at least one wheel. If you only lock a wheel, a thief can simply remove it and walk away with the rest of the bike.
Keep the lock off the ground. Thieves use the ground as leverage when using bolt cutters or pry bars. Position the lock high and with as little slack as possible.
Use two locks if possible — a U-lock on the frame and rear wheel, and a cable or chain for the front wheel. Most opportunistic thieves will move on to an easier target.
Lock your bike in well-lit, high-traffic areas. Thieves prefer to work unobserved.

Register your bike's serial number

Every bicycle has a unique serial number stamped into the frame, usually located on the bottom bracket (the underside of the frame where the pedal cranks meet). This number is essentially your bike's fingerprint and is the single most important piece of information for recovery if your bike is stolen.

Despite this, most cyclists have never written down their serial number — and when their bike is stolen, they cannot provide it to police or identify their bike if it turns up for sale online.

Register your bike on SerialCheck today. It takes less than a minute: flip your bike over, find the serial number on the bottom bracket, and add it to your SerialCheck account. If your bike is ever stolen, you can instantly flag it as stolen in the registry, making it searchable by anyone checking a serial number before buying second-hand.

Photograph and document everything

Take clear photos of your bike from multiple angles, including any distinguishing features — scratches, stickers, custom parts, or aftermarket accessories. Store these photos alongside your serial number in your SerialCheck account. Keep a copy of the purchase receipt as well, as this proves ownership and is essential for insurance claims.

If your bike has any unique modifications — a particular saddle, handlebar tape colour, or custom wheel build — note these down too. They can help identify your bike even if the serial number has been tampered with.

What to do if your bike is stolen

If the worst happens, act quickly:

Report it to the police. File a report online or at your local station. Provide the serial number, photos, and a description. You will receive a police report number, which you will need for insurance.
Mark it as stolen on SerialCheck. Log in and flag your bike's serial number as stolen. Anyone who later searches that serial number — whether a buyer, a pawn shop, or another community member — will see the stolen alert.
Monitor online marketplaces. Check Gumtree, Facebook Marketplace, and local buy-and-sell groups daily. Stolen bikes often appear for sale within days. If you spot yours, do not confront the seller — contact police with the listing details.
Notify your insurer. If you have contents insurance or specific bicycle insurance, lodge a claim as soon as possible.

Use SerialCheck to protect your bike

SerialCheck is a free, community-driven registry built for exactly this purpose. By registering your bike's serial number before anything happens, you are taking the most important step towards recovery. It costs nothing, takes a minute, and could make all the difference if your bike is ever stolen.

Our community of users also helps by checking serial numbers before buying second-hand — creating a network effect that makes it harder for thieves to sell stolen bikes and easier for owners to get them back.

Don't wait until it's too late. Create your free SerialCheck account and register your bike today.