[chrischen]

They could implement a system like iPhones (all iPhones register with Apple servers and lock up if reported stolen).

Mandatory serial numbers, and make it illegal to purchase or own a bike without a serial number, or to buy a stolen serial number.

[Symbiote]

Bikes already have serial numbers.

It's called a frame number, and is stamped into the metal, usually on the bottom bracket (where the pedals connect).

At least in the UK, there's a police register of stolen bikes using these numbers. It's also illegal to buy stolen property.

https://www.immobilise.com/

[lostlogin]

If you don't enter the correct passcode the derailed will jam, the tyres go flat, the brakes soft, peddles squeak and the handle bars will be 5 degrees off square. Basically you get my bike.

[qq66]

Illegal to own a bike without a serial number? That sounds like overkill.

[magni-]

That's what it's like here in Japan: http://www.tokyobybike.com/2013/11/how-to-register-your-bicy...

[chrischen]

Sounds like cars.

[fian]

Expensive carbon bike frames can't be stamped with serial number. I have had a few carbon frames, I think only one had a visible serial number on the outside...on a sticker. None of the bike shops could provide a serial number at time of purchase.

[walrus01]

The metal insert for bottom bracket (BB30 or not) can have an SN. this is permanently glued to the frame.