Yerka

The world's first unstealable bicycle (pre-launch)

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This is pretty interesting. I'd like to hear more about how resilient it is against various attacks that work even on U locks like pressure. The connector looks kind of small. This also still leaves the tires up for grabs so you still will want to carry a chain I suppose. The price is great though for an entry level Fixie with this feature.
Bike with a locking mechanism built directly into the frame - to steal it you'd have to break the bike itself. Neat!
Love the novel design. I'd be concerned about flexiness. Steel is not the stiffest material around. But I guess it'd make for a super comfortable ride :)