1989-1990
Replace the rear wheel with one from a 1991-1999 FZR600, then see below.

1991-1999
Go one size up (wider) on the rear (150/60/18). The stock wheel will safely accomodate the bigger tire size.

Most of these tires are not available in the US. Those that are available in the US are indicated.

• Bridgestone
  • Bridgestone BT014 (front 110/70/17; rear 150/60/18)
  • US Bridgestone BT014 (front 110/70/17 or 120/70/17; rear 150/60/18)
  • Bridgestone BT012SS (front 120/70/17; rear 150/70/18)
  • Bridgestone BT090 (front 110/70/17; rear 150/60/18)
  • Bridgestone BT92 (front 110/70/17; rear 150/60/18)
  • Bridgestone BT45 (front 110/70/17 or 120/70/17; rear 130/70/18, 140/70/18 or 150/60/18)
  • US Bridgestone BT45 (front 110/70/17 or 120/70/17; rear 130/70/18, 140/70/18 or 150/70/18)
• Dunlop
  • GPR Alpha-10 (front 110/70/17 or 120/70/17; rear 140/60/18 or 150/60/18)
• Avon
  • Storm ST Front and Rear
  • Storm ST Front and Rear
• Continental
  • TKV 11/12 Front and Rear
• Pirelli
• Shinko
  • US Podium (front 110/70-17, rear 140/60-18 or 150/60-18)