Originally Posted by MMACH 5

I remember an item from a few years back. I've tried to find where I saw it, but have had no luck. It was a lockable headset. Instead of an Allen bolt in the middle of your top cap, there was a key slot. With the key inserted, you could turn you handlebars sideways and then lock them in place there (to make it take up less space for storage). It would be hard to steer with the handlebars attached sideways.

Or, you could turn the key the other direction and it just left the handlebars loose. Basically, you can't steer a bike without the handlebars locked in place.