maybe there is a different approach.

warning heresy alert

put all your bike on a planned ride rotation for the next few months
after the first month record whether you are excited to ride the bike that comes up in the rotation

If you are not excited..... do the 5 whys
1) why am i not excited to ride this bike
2) based on why I an not excited, why can't it be changed to make it better?
3) Why can'/wont i make the change
4)Why keep the bike if change can;t be made (lots of valid reasons like uniqueness and history
5) why not say to heck with it and invoke N+1