The Yanmar YM187 tractor is listed with a 20×8.00-10 front tire and a 31×15.5-15 rear tire.
Yanmar YM187 Tire Size Chart
Configuration
Tire size
Lawn/turf front
20×8.00-10
Lawn/turf rear
31×15.5-15
Recommended tire pressure
There isn’t a single fixed Yanmar YM187 tire PSI number—your right pressure depends on load and terrain; and you should stay within the “max pressure” printed on the tire sidewall. For reference; one Yanmar owner runs about 6–8 psi when lightly loaded and about 20–25 psi for heavier loader work; but your best value may differ based on how you use the tractor.
Before buying replacement tires
Match the complete sidewall size, rim diameter, axle position, 2WD/4WD configuration and tire type before ordering. On driven front axles, changing overall tire diameter can upset the required front-to-rear rolling ratio.
Tire Pressure
Recommended tire pressure: There isn’t a single fixed Yanmar YM187 tire PSI number—your right pressure depends on load and terrain; and you should stay within the “max pressure” printed on the tire sidewall. For reference; one Yanmar owner runs about 6–8 psi when lightly loaded and about 20–25 psi for heavier loader work; but your best value may differ based on how you use the tractor.
Pressure warning: Confirm the correct pressure in the official operator’s manual and the tire manufacturer’s load-and-pressure chart before inflation.
Wheelbase and Ground Clearance
Wheelbase
57.6 inches 146 cm
Ground clearance
12.6 inches 32 cm 10.8 inches 27 cm
Specification disclaimer
These specifications are provided as a reference and may vary by production year, country, axle, wheel package and previous tire changes. Before purchasing, fitting or inflating tires, confirm the specifications using the Yanmar official U.S. website, the official operator’s manual and the markings on the tires currently fitted.
