Just been out for a run, and two teenagers tried to drag me off the C5 - tried to kick me in the head etc to take the C5. It reminded me that the C5 is actually a target because of its uniqueness and value.
Luckily, I was facing downhill, so managed to get away from them (not much hope of me being able to put up too much of a fight), but it's now got me wondering if there's any way to immobilise the C5 completely while seated, and in a hurry? Just enough so that they can't just jump in and ride off if they do manage to drag you out - maybe something that slides between the wheel spokes. Obviously, it wouldn't stop someone carrying it off, but every bit helps.
Not sure I could get away with carrying a crowbar with me....