The tires used by the Royal Dutch Shell and other British and European companies for their SUVs, vans, and buses were manufactured by the Uniyran firm, and have been used since 2006.
The company was founded by the nephew of the late British engineer, Paul Binswanger, and the brand was originally a line of sport utility vehicles for the Royal Air Force.
It was acquired by Shell in 2008, and Shell now makes a variety of SUVs and vans under the Uniar brand.
The tires are manufactured by a subsidiary of the Swiss company Michelin, which has been awarded more than $50 billion by the French government in a bid to boost the efficiency of its tire factories.
Shell also uses the Uniyuan brand for its vehicles in Asia.
Shell’s SUVs have been criticized for not being sufficiently safe, the company says, citing a number of accidents in Asia and the United States.
Shell has made changes to its tires since 2007, including installing a safety valve on the rear of each tire to prevent it from overheating.
In 2012, the American manufacturer announced it would phase out Uniyrans tires by 2020, but the change didn’t stop complaints about their safety.
“Shells tires are made in Italy and have safety valves and no heat or overheating,” the American company said in a statement.
“We are making the changes necessary to continue to manufacture our tires safely.”
Shell’s tires were also criticized in a recent study of the tire industry.
The study found that, by and large, tire manufacturers are more expensive than their competitors, with the average price of Uniyras tire in Europe at nearly $4,000 per unit.
“This shows that tire makers are charging much higher prices than their rivals,” the study said.
Shell said it plans to keep the Uniymans tires on the market and that it will keep buying Uniyrains tires from Uniyranos, a company in the United Kingdom.