for those who kpkb say Goodyear sidewall soft & squishy:
Three-tier range comprising SuperSport, SuperSport R and SuperSport RS
Innovative technologies enable significant improvements to braking distances and lap times
http://news.goodyear.eu/products-and-services/all/goodyear-pushes-the-limit-with-new-race-inspired-eagle-f1-supersport-range-for-road-and-track/s/51e7cd71-2088-4d59-a4c8-bd6b61829bb0