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Yokohama BluEarth-air EF21: light as air for improved fuel efficiency

At the Geneva International Motor Show, Yokohama has presented its new, more environmentally friendly BluEarth-air EF21 tyre.

Geneva Motor Show 2019: the new Yokohama BluEarth-air EF21 tyre

Yokohama BluEarth air EF21, new, more environmentally friendly tyre. © Yokohama

Two A’s on the EU tyre label

At the Geneva International Motor Show,Yokohama has announced one of its engineers latest design techniques. Seeking to propose a more environmentally friendly tyre, the Japanese tyre manufacturer has developed the BluEarth-air EF21, which will be launched in Europe in spring 2019 in only one size, 205/55 R16 91V.

With its lightweight structure weighing 25% less than a similar tyre such as the Advan dB V551, the BluEarth-air EF21 promises a high level of safety, especially in wet conditions, while being more economical. This is why it has received an A-rating for rolling resistance and wet grip on the EU tyre label for its performance.

Nouveau pneu Yokohama BluEarth air EF 21 présenté au Salon de l'automobile de Genève 2019

© Yokohama

A more efficient, state-of-the-art technology

Yokohama has focused on the use of a lighter and highly rigid filler in the bead of the tyre. If the lower tyre mass reduces the weight of the vehicle and improves fuel efficiency, it also reduces the resources used and CO2 emissions during the manufacturing stage.

Yokohama has also developed a custom-made compound for the BluEarth-air EF21 without compromising its safety. The compound uses nano-particles of silica and a highly reactive coupling agent and silica dispersant to strengthen polymer bonding. This new mixing technology called “A.R.T.” helps increase the contact area of the tyre with the road surface, and improves braking performance on wet roads compared with other tyres using Yokohama’s conventional mixing technology.

On the design side, the Yokohama BluEarth-air EF21 tread pattern has been developed to deliver optimum wet performance. Longitudinal grooves have been positioned to improve water evacuation and to prevent tyre deformation. These grooves change shape as the tyre wears down to keep the same efficiency over time. The positioning of sipes has also been re-designed to deliver better grip, especially on wet road surfaces.

Yokohama has also worked on the shape of the tyre’s shoulder area to improve braking performance and reduce noise. Still with the aim of reducing the impact tyres have on fuel consumption, the Japanese tyre manufacturer has studied the aerodynamics of the BluEarth-air EF21.In addition to the optimised overall design, the various markings on the sidewall are flat compared with the usual elevated lettering.


The Yokohama BluEarth-air EF21 summer tyre will be available throughout Europe from spring 2019 in only one size, but not the least popular, the 205/55 R16 91V.


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