In my "formative" years, having two meant assessing which one was rideable and which would remain in a state of disrepair. Once both were inop, the easiest to fix would win. At some point I realized that my definition of "rideable" was beginning to include issues such as no brakes or lights. That's when I went down to only one bike. On that bike I was pulled over by the cops and first heard the descriptive term "riding without a vehicle".