Simply put, my helmet was stolen using this lock on the very first day I used it at noon. I parked in San Francisco, which is known for a lot of theft. If you typically park in areas less prone to theft, this lock will likely be a good deterrent, but in practice it's easy to pick. The T-bar used to connect the lock to the bike is fragile and can be easily removed. Overall the lock is easy to install and use, but I wouldn't recommend this method for securing a helmet. Locked saddlebags or carrying a helmet is one way to ensure your helmet doesn't get stolen.
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