What do all of the folks who brag about how easy it is to steal a bike that uses the "Sheldon Brown" method have in common? None of them have actually attempted the "feat" that they claim is so easy.
Over the past month or so, five or six different guys have bragged that they think they can defeat the Sheldon Brown method in just a few seconds. None of them have actually documented that they have ever done so.
Okay, braggers. Let's see your results. Lock up a bike CORRECTLY using the Sheldon Brown method, with a "gold" rated u-lock around the rear wheel and around a beefy steel pole set in concrete, such as a parking meter.
Then, attack that bike using the portable tools that real-world crooks use. And, in the real world, crooks use portable tools that can be concealed under a jacket, or in a messenger bag, not tools that weigh fifty pounds, or that are five feet long, or that require access to 1000 watts of electricity.
Put your results on video and post the video. What we are gonna see is eight, ten or twelve minutes of sweaty effort. And a ruined rear wheel. And, a bike that can no longer be ridden, nor will any pawn shop be interested in buying it.
Ten minutes of sweaty effort. A ruined rear wheel. A bike that is unrideable and that can not be easily resold or pawned. Four reasons that the "Sheldon Brown" method works in the real world, as opposed to the imaginary world where people brag about stuff they THINK they can do.