Supercross Vision F1x: Formula 1 Carbon Meets the BMX Gate Supercross BMX has taken its championship-proven Vision F1 frame and pushed it even further with the new Vision F1x—a material upgrade aimed squarely at maximizing power out of the gate. While the geometry remains the same as the race-winning Vision F1, the big change is in the carbon. The F1x is built using a proprietary blend of Toray M40x and M46x prepreg carbon fiber, materials commonly found in Formula 1 chassis