I was going to pose the same question on a new thread. I will be in Zurich for a couple of weeks in August. Here in Los Angeles there are a couple of shops that rent out decent demo road bikes by the day, or even by the week. They aren't great bikes, usually aluminum frames with 105 components, but they are fine for training rides.

I've been to Zurich loads of times, but never since I've taken up cycling again. Now I'm eager to get out those beautiful roads.