韓国のハンコックタイヤ は9月に開催されるフランクフルト国際モーターショー（IAA）に空気不要タイヤ「i-Flex」のプロトタイプを出展する。ポリウレタン樹脂とリムを組み合わせた構造で、最大95％をリサイクルできる。軽量であるほか、空気圧を調整する必要がなく、燃費改善や騒音の低減、安全性が向上するなどの利点がある。
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