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Key Fob for a Bicycle Answered

Hello all! I'm going to be shopping for a bicycle here in a week or two, and based on a conversation I had with someone I'd like to know if anyone has done this, or if it's even possible:

Making a key fob for a bicycle. Even though having a locking mechanism on a bike itself is a dumb idea I'd just like it for kicks. Y'know, after I've chained up my bike somewhere outside a store, turn around and "lock" it like a car as I'm walking away.

Seems possible, but I just don't know how to go about this. Anyone have any ideas?

Thanks for your time and effort!


Not really any ideas. But what bike and why not buy a chain lock?


Check out this mtb video if you like biking!