Les, I ran my NCT"S from Mobile, AL to Los Angeles, CA when the DOA EXPO was last held there. When I got back to Mobile, I installed the YokO's AVS. The difference in ride quality was suprising. The Yoko's gave a much smoother ride. I kept my NCT's, approx 20K miles and still look new. This subject has come up many times, and the conclusions end up the same. Put new modern tech tires and save the NCT's for Concours shows.