No lock for me. All that money I paid for my fancy, lightweight bike, isn't going to be offset by a lock. My bike doesn't leave my sight.
Sometimes, though, I'll be just enough of a distance away from my bike that someone could, theoretically, jump on it and ride off before I could do anything about it. That's when I release the skewers, and put the chain into the highest gear, as well as release the brakes.
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