I finally rode Denver B-cycle bike number 420 again today. It's significant for me because this was the first bike that I rode on the day of the launch of the system. In the past few months, I've taken note of the various bikes I've checked out and ridden, including number 001 (also known as the Mayor's bike), many of the other single digit bikes, as well as number 500. However, this is the first time I've revisited this particular bike. I suppose the ID number of this bike carries another significance, especially in Colorado, but that's another topic.