2004-2005 660 Yamaha Rhino Factory Service Manual, Page 116Get this manual
CHECKING THE TIRES CHECKING THE TIRES WARNING
TIRE CHARACTERISTICS 1) Tire characteristics influence the handling of vehicle'sThe tires listed below have been approved by Yamaha Motor Manufacturing corporation of Americafor this modelIf other tire combinations are used, they can adversely affect your vehicle's handling characteristics and are therefore not recommendedManufacturer Front GOODYEAR Rear GOODYEAR Size
25 8-12 NHS 25 10-12 NHS