OEM Tires and wheel sizes (factory service manual)
Tire Size Wheel Size
Front (86-93) 110/80VR-18 or 110/80-V18 2.15” x 18”
Front (94+) 120/70R-18 59V 3.00” x 18” Note: 94+ OEM tire measures 111/78-18 110/80-18 best fit
Rear  160/70R-17  5” x 17” Mod
Rear 170/60R-17 5” x 17” Mod
Radial or Bias? (R or B) Handling (stable, sporty, twitchy) Mileage (approx) Recommended Pressure (F/R)
Bridgestone
http://www.motorcycle-karttires.com/
Battlax BT-021 110/80ZR-18 R Smooth airplane-like Roll-in, good life, secure feel, great wet, great tire overall 6 - 8k 36/40
Battlax BT-021 170/60ZR-17  R Smooth airplane-like Roll-in, good life, secure feel, great wet, great tire overall 6 - 8k 36/40
Michelin
http://www.michelinmotorcycle.com/
Pilot Road (Road 2 likely compatible) 110/80ZR-18 discontinued   R Outstanding tire.  Secure, stable at all lean angles, great wet, drag pegs anytime 5 - 6k 36/40
Pilot Road  170/60ZR-17 59W R Outstanding tire.  Secure, stable at all lean angles, great wet, drag pegs anytime 5 - 6k 36/40