I just had all four of my Continental ExtremeContact DW 21" tires replaced with the newer Continental ContiSportContact 5's from the LA Service center. These new tires have a foam insert to reduce road noise. I must say they are MUCH quieter than the old ExtremeContact DW's. On cement sections of the freeway the old tires were very loud. The new ContiSportContact's are quiet on all surfaces. Now the loudest sound at freeway speeds in wind noise instead of tire noise. The handling, although not as crisp as the ExtremeContact tires, is perfectly acceptable. These are a nice upgrade from the original Continental tires.