when a real race car pits and gets new TIRES they have a film or coating that must be worn off... the blue represents new tires or COLD,, as they heat up they turn green and optimal traction is obtained,.... eventually you will wear out all tread and thats red...
DO you own a bicycle?? go to a bike shop and look at new tires.. you will see the film or coating im talking about.
BEST TIRES FOR ENDURANCE = SUPER SLICKS