EMC increases grip potential and improves thermal stability to make sure the tire performance remains consistent as temps go up Enhanced Micro-contact-patch Compound (EMC) technology used for both front and rear shoulder compounds 3D cross grooves designed to optimize rigidity and improve contact with the road Dry grip and wear life significantly improved without sacrificing wet performance W-rated for speeds up to 168+ mph. TIRE S21 200/55ZR17 78W
