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Dutch bike lock, mounted on the seat-stays. It's unlocked, with the key still in the lock (it won't come out unless the bike is locked). The lock is a hollow circle (torus) around the wheel rim with a gap at the bottom for the spokes to pass through. Pushing the red handle pushes the shackle out of the left side of the torus go around the rim and into the right side of the torus, completing the circle and making it impossible for the wheel to turn or be removed.

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Dutch bike lock, mounted on the seat-stays. It's unlocked, with the key still in the lock (it won't come out unless the bike is locked). The lock is a hollow circle (torus) around the wheel rim with a gap at the bottom for the spokes to pass through. Pushing the red handle pushes the shackle out of the left side of the torus go around the rim and into the right side of the torus, completing the circle and making it impossible for the wheel to turn or be removed.
https://mastodon.sdf.org/system/media_attachments/files/113/479/762/838/045/680/original/75df184234b76607.jpg

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Bob Jonkman (bobjonkman@mastodon.sdf.org)'s status on Thursday, 14-Nov-2024 15:06:15 JST Bob Jonkman
in reply to

@MLE_online
I lost (irrevocably) a key to a Dutch-style bike lock, and the spare was lost too. My dad and I spent an entire afternoon trying to get a hacksaw in the right position and slowly (very slowly!) sawing through the hardened steel shackle.
Of course, I found the spare key sometime later, but at least I had the use of my bike in the interim.
@tsherrygeo

In conversation about 8 days ago from mastodon.sdf.org permalink