Khe premium mac 2 dirt bmx tyrethe mac tire is the worlds first freestyle folding tyre with a lower rotating mass and kevlar reinforcement these tyres are designed for performance kevlar strips allow the tyres to be inflated up to 120psi and still retain their original shape features special dirt tread for more grip kevlar beaded for protection durable compound lengthens the life of the tyre low rotating mass reduces the overall weight of the bike recommended pressure min 90psi max 12