Climb or Cruise Propeller? Fixed pitch airplanes.

I want to be able to specifically define any random airplanes fixed pitch propeller, as a climb or cruise propeller.  

The PHAK chapter 7 states that airplanes with fixed pitch propellers will have either a climb or a cruise propeller based on pitch.  Higher pitches will be cruise propellers, and lower pitches will be climb propellers.  

But where is the line drawn?  At what propeller pitch degree would a propeller no longer be considered a climb propeller? 

I have read through the POH for the airplane.  I have read through the maintenance logs.  I have read through the airplane flight manual supplements.  I have even looked up the exact propellers on the manufacturers websites.  

However, I do not understand exactly what determines if a propeller is climb or cruise.  I even know that an airplane I fly has a cruise propeller, because the owner says it has one.  I can tell that it has better cruise performance and it's full throttle RPM is limited and pulled back from red line.

But if I were to just look at the propeller, I don't know how to justify that it is infact a cruise propeller.  

What can I specifically cite so that without a doubt I can classify a propeller as a cruise or climb propeller?

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