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@GA2G
Yes Nhatt, they do work. I've been suggesting on this forum for months, that a motorcycle alarm disc lock, would be ideal through a chainring, if the owner lived in a shared property (for example, a shared hallway).
They've worked for years on motorcycles, and they are highly effective, since they give off a 110db alarm, and is therefore a great deterent to theft. My suggestion regarding the chainring, is because it would fit neatly there, and chainrings are a very strongly made metal part.
Socially, like at Lfgss drinks, only one person needs to have one of these set, and if many bikes are locked together, the alarm would go off if anybody tried to move any of the bikes, not just the bike with the alarm on.