When I was a kid I had a Schwinn Continental that I would take to the schoolyard on weekends and ride all around w/o hands - circles, figure eights, you name it. Surely it had a very stable geometry, but now it seems beyond me that I could ever do that.

Of my two present road bikes, one is much more stable w/o hands then the other. I'm not exactly sure why.

Today during a ride I picked my water bottle out of its cage and realized that the top was loose. I quickly used both hands to tighten it, but it made me very nervous.