YOKOHAMA's Technology
Aerodynamic technology that controls airflow around tires and enhances vehicle’s aerodynamic performance
Tires
Turbulent airflow that occurs around a moving automobile affects the vehicle’s performance. Yokohama Rubber has been conducting research for more than 10 years to develop aerodynamic technology that controls the airflow around rotating tires and reduces vehicle drag. This research has focused on discovering the optimal shape for the tire’s sidewall. In 2024, we have realized the commercialization of tires equipped with this technology.
Reducing air turbulence that reduces vehicle’s fuel efficiency and hampers steering stability
Air flows around rotating tires of a vehicle in motion in very complex patterns. Air entering the wheel housing from below the front of the vehicle collides with the tires, flows around the wheel housing, and flows out to the side of the vehicle. This complex airflow creates turbulent airflow around the tires, which contributes to an increase in aerodynamic drag.
It also is well known that turbulent airflow on the side of the vehicle’s body affects the airflow around the vehicle and can reduce handling stability. In addition, the sound generated by turbulent airflow hitting the vehicle’s body increases vehicle noise.
Placing small dents and protrusions on tire’s sidewall is an aerodynamic technology that reduces air turbulence around rotating tires and improves vehicle fuel efficiency by reducing drag, while also contributing to the vehicle’s handling stability and quietness.
Yokohama Rubber’s first commercially available aerodynamic tire with fin-shaped protrusions
One element of Yokohama Rubber’s aerodynamic technology is the “fin” on the tire’s sidewall. Fish tail–shaped fin protrusions on the sidewall reduces turbulent airflow around the tire and promotes smoother airflow on the side of the vehicle.
Changing the number, shape, and placement of these fins makes it possible to realize an optimal balance between fuel efficiency, handling stability, and quietness. However, the optimal shape and placement of these fins differs for vehicles of different body shapes.
Accordingly, the ADVAN A50, Yokohama Rubber’s first commercially available aerodynamic tire, has 12 fins arranged in V-shapes on the outer sidewall of the tire, which is now being sold as afterparts for Daihatsu Motor's new COPEN mini sports vehicle, which went on sale at Daihatsu dealers around Japan in September 2024.
Yokohama Rubber will continue its research and development that promotes the advancement and commercialization of aerodynamic technology, which will contribute to improved performance of automobiles.
