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Kumho Ecsta ASX KU21 Tires are On Sale Plus Free Shipping! On the outside, the Ecsta ASX molds a high technology silica and carbon tread compound into an asymmetric tread design that features large outside tread blocks for quick response and sporty handling with high volume circumferential and high angle slant grooves to resist hydroplaning and enhance wet traction. Constant contact center blocks help reduce noise while providing continuous road contact to improve straight-line stability. Internally, Ecsta ASX tires feature Kumho's Dynamic Casing Shape Technology that controls casing tension throughout the tire.