Be careful with the Tire Rack's "ratings". Things that are important to most drivers might be detrimental on a Pantera. The RT615 has more tread grooves than the RT660. As a rule, a tire with more grooves is better in the wet and more comfortable. The tire with fewer grooves would be better in the dry and be more stable under heavy braking. What's best for you depends on how you operate your vehicle.
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