M403/M404 Intermediate Terrain Tires Bridgestone M403, 60/100-12, Bias, Front Performs well in a wide range of soils. M403 front tire provides the rider with improved cornering control and feedback, even at full-lean angles. M404 rear tire offers added traction and slide control, allowing better acceleration out of corners. Prototype versions developed and tested by top AMA Supercross and Motocross racers and factory teams.