What is my XYZ worth? How much is THIS worth? Value my...

Going from N=3 to N=1, help me value the two I'm saying goodbye to.

• Cannondale Synapse 105 6 (2015) . Bought in January 2016, only been used a couple of times a year since then. Maybe done 500 miles. Will look immaculate once I give it a clean.
  
• A modded 2015 Genesis Flyer(I stuck some funky handlebars on it and removed the back brake). Much more well loved than the Cannondale - used to be my daily ride for a good 2 or 3 years. Coupe of dings in the frame.
  
  

Sorry there wasn't enough space in the hall to take a full pic of the Cannondale...

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