Buying a used bike: a mechanic's checklist

What to check before you buy a second-hand bike or e-bike in Australia: stolen-bike checks, your rights in a private sale, paying safely, and a mechanic's inspection from frame to tyres.

By the Ashburton Cycles workshop · Updated 1 October 2026 · 7 min read

The short version

Check the frame serial number before you pay: search Bikelinc (WA, ACT and Tasmania) and BikeVAULT (national). Walk away if the seller will not show you the serial.
Most consumer guarantees do not cover private sales, but the seller must own what they sell: a stolen bike can be taken back from you.
Pay through a secure payment method, keep messages on the platform, and see the bike in person first. An unbelievably low price is a warning sign.
Look hard at the frame. Carbon damage is not always visible, so if in doubt have a shop inspect it before you hand over money.
Used e-bikes: check the battery and make sure the bike is legal in your state. NSW police can now seize and crush illegal e-bikes.

Before you go: make sure it is not stolen

Ask the seller for the frame serial number before you meet. It is usually stamped under the bottom bracket, where the cranks meet the frame. Then search it:

Bikelinc, run by Crime Stoppers WA, is the register used in Western Australia, the ACT and Tasmania. Anyone can search a serial to see if it is listed as lost or stolen, and police in those states have access.
BikeVAULT is a free national register with a public search of stolen, missing and found bikes. Crime Stoppers NSW partners with it and tells second-hand buyers to check it. The old National Bike Register has merged into BikeVAULT.
Bike Index is a free global register with a public serial search, used mostly in North America.
Victoria, South Australia and Queensland have no public police register, and we could not find one for the Northern Territory. A clean search is reassuring, not proof: many stolen bikes were never registered.

Walk away if

the serial number is missing, scratched off or does not match the listing; the price is far below similar bikes; or the seller cannot say where the bike came from. If you think a bike is stolen, call the Police Assistance Line on 131 444.

For a Bosch e-bike, Bosch's online battery check takes the battery's serial number and shows whether a service case is registered against it. Bosch warns against buying defective, repaired or stolen batteries.

Your rights when you buy used

From a private seller: the ACCC says most consumer guarantees do not apply to one-off sales between two people, such as a Gumtree or Facebook Marketplace sale. The guarantees that still apply are about ownership: the seller must have the right to sell it, nobody should be able to take it back from you (for example because it was stolen), and no money should be owing on it.
From a business: consumer guarantees do apply, judged against the bike being second-hand, its age and its price.

Paying safely

Scamwatch lists the warning signs of a buying scam: a price that is unbelievably low, or a request to pay by money order, pre-loaded card or to several PayIDs. Its advice:

Use the platform's secure payment method, and keep your messages on the platform.
Inspect the item in person before you pay.
If you pay by PayID, check the name that comes up matches the seller.

On Yellow Jersey, buyers pay through Stripe at checkout, so there is no cash to carry to a meeting.

The mechanic's inspection

Do this in daylight, with the bike clean enough to see the paint. It takes about fifteen minutes.

Check	What to look for
Frame and fork	Cracks, dents or wrinkles, especially at the joints, under the down tube and around the head tube. Park Tool notes that cracked paint can mean the tube has moved underneath. Carbon flexes and then breaks rather than bending, and its damage may not be visible: Trek says to stop riding and have a shop inspect it if you suspect damage.
Chain	Measure wear with a chain checker. Park Tool says to replace at 0.5% on 11-speed and up, 0.75% on 10-speed or fewer, and 1% on single-speed. No checker? 24 links should span 12 inches (30.5 cm); more than 1/16 inch (1.6 mm) over and the chain is worn.
Gears	Shift through every gear, front and back. Skipping under load usually means a worn chain and cassette.
Brakes	Both brakes should bite firmly without the lever reaching the bar. Shimano says not to use disc pads 0.5 mm thick or less, or rotors 1.5 mm or less. Rim brake pads are worn once their grooves are gone.
Wheels	Spin each wheel: it should run straight without rubbing. Squeeze pairs of spokes for loose ones, and rock the wheel sideways to feel for play in the hub.
Headset and bottom bracket	Hold the front brake and rock the bike back and forth: a knock means the headset needs attention. Push the cranks sideways: any play points to a worn bottom bracket.
Suspension	Push down on the fork and shock. They should move smoothly and quietly, with no oil on the stanchions. Ask for service receipts; without them, assume a service is due (Fox recommends one every 125 hours or yearly).
Tyres	Cuts, cracked sidewalls, or casing threads showing through the tread mean new tyres.
Test ride	Check the size fits (see our bike size guide), and listen for creaks and clicks.

Extra checks for a used e-bike

Battery: do not buy a battery that is swollen, leaking, damaged or gets hot. Bosch notes batteries are wearing parts and that a dealer can measure remaining capacity, so ask for a recent reading or service records.
Compliance: check the bike is legal where you will ride it. NSW requires an EN 15194 e-bike (500 W bikes that cut out at 25 km/h stay legal until 28 February 2029), and police there can seize and crush illegal e-bikes. Queensland requires a 250 W EN 15194 e-bike with a compliance label; older 250 W bikes without one can be ridden until 28 February 2027, after which they need a verification label. Bikes limited only by an app or switch are still illegal. See our e-bike laws guide.
Conversions: a bike with an aftermarket motor kit is illegal to ride on public roads and paths in Queensland, and in Victoria converted e-bikes are banned on trains.
Chargers: make sure the original charger comes with it. A mismatched charger is a fire risk (see e-bike battery safety).

Budget for the first service

Even a good used bike usually needs a service and a few wear parts: a chain, brake pads or tyres. A standard service typically costs about $200 plus parts. See how much a bike service costs for current prices, and factor it into what you offer.

Common questions

How do I check if a bike is stolen in Australia?

Ask for the frame serial number and search it on Bikelinc (used in WA, the ACT and Tasmania) and BikeVAULT (national). If you suspect a bike is stolen, call the Police Assistance Line on 131 444.

Do I have any rights if I buy a bike privately?

Fewer than buying from a business. The ACCC says most consumer guarantees do not apply to one-off private sales, but the seller must have the right to sell the bike, and nobody should be able to take it back from you.

Is it safe to buy a used carbon bike?

Yes, if it has not been crashed. Carbon damage is not always visible, so look closely for cracks and chips, ask about crashes, and have a shop inspect it if you have any doubt.

What should I pay for a used bike?

Compare the asking price with similar bikes for sale now, then take off what the bike will need: worn chains, tyres, brake pads and overdue suspension servicing all add up.

Find a used bike

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Sources

Written by the workshop at Ashburton Cycles, 277 High Street, Ashburton VIC. We check every fact against the sources above and update the guide when rules or prices change. Last checked 1 October 2026.

General information, not legal advice. Rules and registers change, so check the official sources above.