product name: HONDA CBR900 floating brake disc of Honda

1998 brought the first major changes to the CBR900RR. In order to achieve a more optimized balance of rigidity, Honda significantly altered the 1996 CBR's chassis and suspension. The frame and swingarm were fabricated from larger, thinner-walled extrusions for reduced torsional rigidity. The fork and shock internals were re-designed, and the swingarm pivot raised by 5 mm (0.2 in). Revised ergonomics brought the bars 10 mm (0.4 in) higher and swept back five degrees more than earlier models, along with a slimmer gas tank. Engine updates included a bump in displacement to 919 cc (56.1 cu in) via a 1 mm (0.039 in) bore increase, slightly higher compression, a curved radiator, larger exhaust, extra clutch plates, smaller alternator, and the addition of a throttle position sensor. The 1996 model carried over to 1997 unchanged except for the updates to color/graphics offerings.

In 1998, Honda continued subtle refinements in the CBR900RR's chassis. It saw frame stiffness closer to the original model's, revised suspension internals, and 5 mm (0.2 in) less triple clamp offset (an almost universal aftermarket upgrade to previous models). New brake calipers acted on larger front discs, the fairing was re-shaped and raised footpegs subtly changed ergonomics again. Eighty percent of the engine's internals were all-new to reduce weight and minimize friction; other updates included redesigned combustion chambers and porting, aluminum composite cylinders, new pistons, a smaller and lighter clutch pack, revised gearbox ratios, larger radiator, and a new stainless steel exhaust header.