 The engine is housed in a steel box section perimeter frame, air-assisted 41 mm telescopic front forks and an adjustable monoshock at the rear.The front brakes are twin 296 mm discs using three piston Nissin calipers on later models (two piston calipers 1987-88), the rear is a single 256 mm disc, and DCBS are used on all models after 1992.The CBR's engine went largely unchanged throughout its history.