The year was 1989 and motocross bike design was rapidly changing. "Inverted" forks were clearly a performance advantage but to get the most out of this new type of suspension, frames needed to be more rigid. Enter the 1989 KX125SR and KX250SR which debuted an innovative steel perimeter frame at the All-Japan Motocross Nationals. Frame spars wrapped around the fuel tank rather than one piece underneath. Rider Atsushi Okabe won the 250 class on the new chassis, which eventually evolved into the al