U-Lock Gets Hammered: Is Compressed Air a Bike Thief's New Best Friend?

Is Compressed Air a Bike Thief's New Best Friend?

We've seen compressed air power a homemade rocket, shoot erasers across the room, and even remove dents from a vehicle, but how about breaking a bike lock?

As Theodore Gray of PopSci explains, no matter how tough your lock is, there's one thing that will defeat it every time—and that's temperature.

Image via popsci.com

Most bicycle locks are made of steel, which is incredibly tough, but it gets really brittle when it's cold enough; –13°F, to be specific. So how do you get a piece of steel that cold? With a can of compressed air.

Compressed "air" is actually difluoroethane, a chemical that acts as a refrigerant. When it's sprayed on steel, the tensile strength (how much force it takes to break) doesn't change, but the temperature change makes it less flexible. Less flexibility means it's less tough, so then, you can take a hammer to it and it will (eventually) crack. You can even shatter a really flexible rubber ball if it's cold enough.

So why aren't bicycle thieves using cans of compressed air to make off with every bike they see on the street? Because even though this trick can break the lock, it still takes quite a bit of hammering, which wouldn't exactly be subtle.

You can do this with almost any lock, though, so next time you lose the keys to your toolbox, this might come in handy.

Check out the PopSci article for more details and to see a video of this science "hack" in action.

Want to master Microsoft Excel and take your work-from-home job prospects to the next level? Jump-start your career with our Premium A-to-Z Microsoft Excel Training Bundle from the new Gadget Hacks Shop and get lifetime access to more than 40 hours of Basic to Advanced instruction on functions, formula, tools, and more.

Buy Now (97% off) >

Other worthwhile deals to check out:

Join the Next Reality AR Community

Get the latest in AR — delivered straight to your inbox.


So what's the best way to lock your bike now?
I am sad :(

And how am I supposed to get the said chemical??

Walmart, Harbor Freight, Virtually anywhere that sells electronics or tools. Harbor Freight is the cheapest I've seen at 4$ a can.

Share Your Thoughts

  • Hot
  • Latest