Bell Replacement MX-9 MIPS Twitch Replca (LE) Visor/Peak - Black/RedBell Replacement MX 9 MIPS Twitch Replca (LE) Visor Peak Motocross Hero. The off road world is a dirty, tough place. Chunks of rock and dirt mean business when launched by roosting tires, and even when it's muddy, hitting the ground is always hard. That's why Bell sweated the details on the MX 9, loading it with a tough polycarbonate shell, MIPS energy management system, an adjustable visor, Velocity Flow Ventilation, and a removable, washable, The MX