Tires sizes for SUZUKI GR 650 1983

100/90-19
FRONT
~30 PSI
130/90-16
REAR
~32 PSI

What are the tires sizes for SUZUKI GR 650 1983?

The front tire is is 100/90-19, and the rear tire size is 130/90-16

What are the tires pressure for SUZUKI GR 650 1983?

The front tire pressure is about 30 PSI (~2.07 BAR), and the rear tire pressure is about 32 PSI (~2.21 BAR)

For accurate numbers you should always consult with your bike user manual's, your local dealer or the manufacturer