/ The correct number of bikes to own is n+1.
While the minimum number of bikes one should own is three, the correct number is n+1, where n is the number of bikes currently owned. This equation may also be re-written as s-1, where s is the number of bikes owned that would result in separation from your partner.
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Just seen this on Oliver's [congratulations on Eli!] fine blog, originally from Velominati. Marvelous stuff. Rather timely as I've just given away one of my 5 bikes as I was running out of room. No excuse I know. Though I did enjoy leaving her in the middle of a square on a sunny day with a label saying 'please take me! please love me!' The next day she was gone. Let's hope she's happy.