Ford Motor Co. recommended inflating the controversial Firestone tyres on their Explorers models to less than the maximum levels required to reduce the risk of roll-overs when turning suddenly, says local media (21/8/00) citing an internal company document. According to 'Foxmarketwire', an internal Ford document dating back to October 1989 showed that the Explorer failed safety tests and was at risk of rolling over when fitted with tyres inflated to 35 pounds per square inch (psi).