Owner's Manual
Page 144
... of section height to section width of tire. 10.5 = Section Width in Inches (in) R = Construction Code - R means Radial Construction. - D means Diagonal or Bias Construction. 15 = Rim Diameter in Inches (in) 144 STARTING AND OPERATING Tire Sizing Chart EXAMPLE: Size Designation: P = Passenger car tire size based on U.S.
... of section height to section width of tire. 10.5 = Section Width in Inches (in) R = Construction Code - R means Radial Construction. - D means Diagonal or Bias Construction. 15 = Rim Diameter in Inches (in) 144 STARTING AND OPERATING Tire Sizing Chart EXAMPLE: Size Designation: P = Passenger car tire size based on U.S.