Rotora Street Challenge BBK: Mazda RX-7 FC3S 86-92** Current lead times ~30 45 days after placing order Updated 4 9 26** This is a street version of the Big Brake Kit on our #26 Time Attack FC RX 7. These kits are for the 5 lug FC RX 7. For Street use and track day fun. For a more serious track only package please see our "Super Challenge kit". 1 or 2 Piece Front Rotors 328mm x 28mm (4 Piston Caliper) 1 or 2 Piece Rear Rotors 328mm x 22mm (2 Piston Caliper) Rotora's high performance Street Challenge