bicyclerollingresistance.com is the place to go if you want to compare road bike tires based on measurable values.

The tires are measured and tested on a self-built test machine for various parameters such as:

• • Rolling resistance at different pressures
  • wet grip
  • weight
  • width
  • thickness
  • puncture resistance

Here is how they test tires: https://www.bicyclerollingresistance.com/the-test