StopTech's latest racetrack and competition brake system comes with the new Trophy STR lightweight forged calipers in six-piston, four-piston and two-piston configurations. Based on the StopTech ST-60, ST-40, and ST-22 calipers, STR calipers feature the same metallurgy and design, but are engineered to provide a 20-percent reduction in weight without sacrificing stiffness or performance. StopTech STR calipers are also available in Sport Trophy kits designed for production, street driven vehicles that utilize dust boots, anti-rattle rotor mounting hardware and include StopTech Street Performance brake pads. All existing StopTech kits can be ordered as Trophy or Sport Trophy kits. STR-60 • Fully forged aluminum construction with hard anodized finish • Patented, bolt-in bridge minimizes caliper compliance for a firmer pedal • Stiffest 6 Piston caliper currently on the market • Uses standard FMSI D1247 pad • Can be used on rotors with outer diameter of 328-380mm and thickness of 28-35mm • ALL finished parts are 100% leak down and pressure tested to 2500 PSI • Uses a popular pad shape readily available in over 15 street performance and race friction compounds • Over 19 different piston size combinations available to tune brake torque to the needs of each individual application • Differential piston sizes minimize pad taper for longer pad life and a firmer pedal • Dust boots are standard for reduced maintenance on Sport Trophy Kits STR-40 • Fully forged aluminum construction with hard anodized finish • ALL finished parts are 100% leak down and pressure tested to 2500 PSI • ST-40 uses standard FMSI D372 pad • Any combination of 8 piston sizes available to match kit to vehicle application • Differential piston sizes minimize pad taper • Dust boots are standard on Sport Trophy kits • Same caliper used by top Speed® World Challenge and Grand-Am Cup Teams STR-22 • Fully forged aluminum construction with hard anodized finish • All finished parts are 100% tested to a pressure of 2500 PSI • Uses standard FMSI D961 Pad • 2 piston opposed design • May be added to cars with existing front StopTech kits • Piston size adjusted for the application, just like our front calipers • Dust boots are standard on Sport Trophy kits