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Old 10-29-14, 09:26 AM
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Conceptualize it this way. Looking at the picture on Sheldon's site, imagine the wheel as a door, hinged at the U-lock and the "doorknob" at the extreme back of the wheel. Now, pretend that the axle is free and open the door toward you, so that the wheel is parallel (in line with) to the U-lock and post. It's not attached to the bike or frame, but it still forms a non-removable barrier (the solid immovable post on one side, and a wheel too big to fit through the triangle on the other. Doesn't matter whether the "door" is open or closed, the result is exactly the same.

The only way to remove the frame is to release the post, the U-lock, or the wheel. No other way.
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