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Comment by ramy_d | Hacker News Reader

I heard 2 horrible things about O-locks. 1 - Every bike has them in europe, 2 - you can open them by jamming a flathead screw driver through the keyhole and twisting. Any truth to that?

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O-locks are pretty much just a nice place to keep your keys while you're biking. Everyone I know goes for separate chains, usually on the pricier end. From what I hear the ones that look like round padlocks are ridiculously easy to break, and the ones with the square lock part with two pins is considered among the best (but sadly also annoying to use).

But that's what multiple bike shop owners told me and they all wanted to sell me a lock, so I don't know if this is true.

Edit: Oh, I forget. O-locks are also very convenient if your bike is still within eyesight and you just want to avoid run-by-thefts. Perfect if you're popping into a shop for food or cigarettes or whatnot.

The thing with an O lock is that is locks the rear wheel. A chain lock then can lock both the frame and front wheel to a pole. Although not 100% safe, most thieves will look for easier targets.

The old style ring locks from 30 years ago were trivial to open with a screwdriver. Modern ones are not. You need to grind through the hardened steel to open those.

That's the very old style one, you could also just open it with a piece of wire.

You can't easily open the lock, but as people can still walk away with the bike it isn't a real deterrent either.

The old models you can just bend open, the material is very weak (just keeps out honest people).

It's not hard to break a modern lock but it requires more than a screwdriver.

1 is a myth, 2 is probably true.

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