a) Helical grooves offer the same drainage effect as regular straight grooves. Acute grooves provide enhanced lateral drainage capabilities.
b) Wide, straight grooves on the shoulder provide excellent drainage during cornering.

c) High-rigidity blocks on the shoulder help the tyre to maintain ist shape during cornering, thereby maintaining traction. YOKOHAMA´s outstanding asymmetrical tread desgin delivers firm grip in the dry. The wide tread also enhances handling.

The outstanding wet-surface performance of the A539 derives from a super-traction compound based on YOKOHAMA´s silica technology. Previously, silica did not disperse readily, making it difficult to use in compounds. To overcome this, YOKOHAMA developed its Zeruma, a special processing agent that allows an ideal diffusion of silica in rubber.

Scientificially arranged blocks suppress the build up of rhythmic noise pattern. Sub-grooves reduce the generation of irritating, low-frequency noise. Variable-depth grooving reduces uneven wear and associated noise. Shallower grooving enhances block rigidity.

Blocks with lower rigidity on the inner side of the tyre deliver gentler, more comfortable contact with surfaces. This smoothing effect is reinforcing by the use of wedge-shaped blocks arranged along the centre.