this post was submitted on 15 Sep 2026
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No Stupid Questions

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33
How do you verify that a used bike that you're buying isn't stolen? (thelemmy.club)
submitted 2 days ago by HobbitFoot@thelemmy.club to c/nostupidquestions@lemmy.world
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[–] FriendOfDeSoto@startrek.website 19 points 2 days ago (2 children)

You may need to doxx yourself a little bit to get a good answer.

I live in Japan where bicycles are registered with the police. So you could take the registration number to the police.

The frames normally have stenciled ID numbers on it and that is important information for the police in Europe, where I had four bicycles stolen when I lived there. So you could ask for the number and go to the police first.

Generally, if I had the inkling of a suspicion that this bike was stolen I'd back off the sale.

[–] kersploosh@sh.itjust.works 11 points 2 days ago (1 children)

I live in Japan where bicycles are registered with the police.

Is that mandatory registration for all bicycles, or voluntary?

I have encountered cities, and even universities, in North America that offer voluntary bicycle registration. Very few bike owners here actually register their bikes, though. And I assume the different registration systems do not sync up, so a thief simply needs to move the bicycle elsewhere when they sell it.

If you have any suspicion the bike might be stolen, then assume it is stolen.

[–] FriendOfDeSoto@startrek.website 10 points 2 days ago

Registration is mandatory and registry may be checked on the street if they see you're missing a wheel reflector etc. I'm not sure if that's by local or national ordinance. Japan has a mountain problem, i.e. most of the country consists of them pushing most of the 100-something million people into the two major plains and a handful of other big cities. Where people live in shoe boxes and converge around train busy stations. Where space is doubly at a premium and most cities have no parking zones for bicycles on the streets. If they didn't force people into paid parking arrangements, the streets or more specifically the often conically narrow sidewalks would become impassable with bicycles. I've seen bicycle "tow trucks" in action in Tokyo. It's just a big open truck with an outfit of lock pickers/cutters that impound illegally parked bicycles. The registry helps reunite owners with their bikes and a nice fine. Theft is less of a problem here and depending on the area you'll see bikes that are locked but not locked to anything immovable and people leaving helmets or other items in the basket because chances are nobody will take it.

[–] nocturne@slrpnk.net 13 points 2 days ago (2 children)

https://bikeindex.org/serials

[–] sem@piefed.blahaj.zone 4 points 2 days ago* (last edited 2 days ago)

Also, for whatever reason (capitalism?) searching 529 also searches bikeindex, but bikes registered on 529 do not appear on bikeindex https://project529.com/garage/

There's a great podcast about everything bike index, including its creation, operations, and a specific campaign to stop an international bike theft ring. [Darknet Diaries] 153: Bike Index 🅴

https://podcastaddict.com/darknet-diaries/episode/189615861 via @PodcastAddict

[–] AskewLord@piefed.social 0 points 2 days ago* (last edited 2 days ago)

this is useless. nobody does this or keeps a database of them.

the only use it has is for warranty claims, or if you have it for you own bike you can use to verify you own it with the police, if they reclaim it. but that virtually never happens.

it's not like chipping your pet where there is a universal standard to which authorities/vets can reference and your ownership is encoded in the database.

[–] Iconoclast@feddit.uk 4 points 2 days ago

You don't. You go purely on vibes.

[–] CapuccinoCoretto@lemmy.world 7 points 2 days ago

Many police services have a serial number lookup. Some people also post what was stolen so a quick search helps too.

[–] grue@lemmy.world 4 points 2 days ago

Only buy bikes being sold at a fair (not suspiciously low) price* from sellers who can answer questions about specs/condition/history.

(* Being offered a bike for free from somebody who wants to get rid of it is an exception to this, obviously.)

[–] Kolanaki@pawb.social 2 points 2 days ago

There should be a serial number somewhere on the body (usually on the bottom or front of the frame up toward the handlebar forks) you can look up to see if it has been reported stolen.

If the plate has been removed or scratched off that would be one indicator it might be stolen, but there is always a chance it was stolen, not altered, and simply never reported stolen.

[–] Archimedes@sh.itjust.works 2 points 2 days ago

Run the frame number through the police, see if it was reported.

[–] AskewLord@piefed.social 1 points 2 days ago* (last edited 2 days ago) (1 children)

I don't. Not my job.

Sold/Bought dozens of used bikes over the years, very low chance any of them was stolen. Flipped quite a few of them too.

Just don't be an idiot. It's obvious if someone is weird and sketchy, and don't buy the bike if they act that way.

[–] JohnnyEnzyme@piefed.social 11 points 2 days ago (1 children)

very low chance any of them was stolen.

What makes you so confident? The person selling the bike might have little or no knowledge or connection to the theft.

[–] AskewLord@piefed.social 1 points 1 day ago* (last edited 1 day ago)

how do people know the bikes I sell aren't stolen?

they don't.

[–] NutinButNet@hilariouschaos.com 4 points 2 days ago

Maybe call the area’s non emergency number and see based on the serial? But that still isn’t perfect and gonna be hard to do unless they give it to you which seems doubtful.

Best practice is “if it’s too good to be true, it probably is”. If they want $25 for a $2.5k bike, it’s probably stolen or you’re going to be mugged/stabbed by a psycho.