1) Overview
The all-new twin-spar aluminum-alloy frame is lighter and simpler, with new tailsection mounting.
The 2003 GSX-R1000 uses a cast steering head section and swingarm pivot-plate section, just
like the previous model, and frame geometry is unchanged. But the main frame spar on each side
is now made of an extrusion with two internal reinforcing ribs, which in effect divide the extrusion
lengthwise into three separate internal compartments. The new main spar design allowed the
GSX-R1000 engineering team to precisely adjust overall frame rigidity, using data from the
development of the new GSV-R MotoGP racebike. The bolt-on tailsection is also simpler, mainly
built using four straight pieces of extruded aluminum-alloy tubing.
Overall, the 2003 GSX-R1000 is about 2.0 kilograms (4.4 pounds) lighter than the previous model.
For racing use only, the 2003 GSX-R1000's swingarm pivot position can be adjusted, using
optional racing kit parts.
The braced swingarm assembly uses extruded main arms welded between the extruded pivot
tube and cast link front section and the axle mount ends. The extruded arms feature an internal
reinforcing rib, dividing the arm into two lengthwise sections and contributing to torsional rigidity.
The new GSX-R1000 has race-proven radial-mount, four-piston front brake calipers like those
used on the new GSV-R MotoGP racebike and on GSX-R racebikes competing in World
Superbike and national superbike series events around the world. A radial-mount caliper attaches
to the front forks with bolts positioned radially, or aligned with the caliper centerline, instead of
using transverse mounting bolts.
Radial-mount calipers are more rigid, with less flex in the mounts and in the caliper body itself.
The front brake calipers are each 50 grams lighter than the calipers used previously, for a total
weight savings of 100 grams.
Because the 2003 GSX-R1000's radial-mount, four-piston calipers produce stronger braking
performance, the diameter of the front brake discs can be reduced from 320mm (12.6 inches) to
300mm (11.8 inches), reducing disc weight by 160 (80 x 2) grams and adding to turn-in
performance.
Race-proven 43mm inverted forks with Diamond Like Carbon (DLC) coated inner tubes and
internal cartridge damping are fully adjustable for spring preload, compression damping and
rebound damping. The single rear shock has a piggyback fluid reservoir and is also fully
adjustable for spring preload, compression damping and rebound damping.
Wide, 17M/C x MT3.50 front and 17M/C x MT6.00 rear cast-aluminum-alloy wheels carry a 120/70
ZR17 radial front tire and a 190/50 ZR17 radial rear tire.
Chassis Design
6. Chassis Design
CHASSIS
DESIGN
6-1
