What size tires do I need for my CB550K / CB550F / CB500K? April 19, 2021 19:15 Updated Front Tire: 19-110/90 (modern sizing) / 3.25-19 (old sizing) Rear Tire: 18-120/90 (modern sizing) / 3.50-18 (old sizing) Related articles Honda CB500 and CB550 4-Cylinder Factory Service Manuals Parts That Will Need Replacement On A Vintage Honda Project Motorcycle aka The "Laundry List" What size drive chain do I need for my Honda CB550K / CB550F / CB500K? What type of fork oil and how much fork oil should I use in my CB550K / CB550F / CB500K? The Late Electric Starter Safety Switch Circuit (Post 1974): Electrical Troubleshooting and Basics on a Vintage Honda Motorcycle