This Roadracing World & Motorcycle Technology podcast features Editor at Large Michael Gougis interviewing John Robinson, the project engineer for the new Dunlop Sportmax Q4 track day tire, at Chuckwalla Valley Raceway. The July issue of Roadracing World features an in-depth analysis of the new Sportmax Q4 and impressions after riding a fleet of modern sportbikes shod with the new, track-oriented rubber, at Chuckwalla.