The 1987 Ford Ranger tire size depends on trim: the 2D Pickup Extra Cab, 2.3 A, 4WD takes P195/75R15; the 2D Pickup Extra Cab, 2.3 A, RWD, Automatic takes P195/75R14; the 2D Pickup Extra Cab, 2.3 A, RWD, Standard takes P195/75R14; the 2D Pickup Extra Cab, 2.3 E takes P195/75R14; the 2D Pickup Extra Cab, 2.9 T, 4WD, Automatic takes P195/75R15; the 2D Pickup Extra Cab, 2.9 T, 4WD, Standard takes P195/75R15; the 2D Pickup Extra Cab, 2.9 T, RWD, Automatic takes P195/75R14; the 2D Pickup Extra Cab, 2.9 T, RWD, Standard takes P195/75R14; the 2D Pickup, 2.0 C takes P185/75R14; the 2D Pickup, 2.3 A, 4WD takes P195/75R15; the 2D Pickup, 2.3 A, RWD, Automatic takes P195/75R14; the 2D Pickup, 2.3 A, RWD, Standard takes P195/75R14; the 2D Pickup, 2.3 E takes P195/75R14; the 2D Pickup, 2.9 T, 4WD, Automatic takes P195/75R15; the 2D Pickup, 2.9 T, 4WD, Standard takes P195/75R15; the 2D Pickup, 2.9 T, RWD, Automatic takes P195/75R14; the 2D Pickup, 2.9 T, RWD, Standard takes P195/75R14, per the factory service manual.
Factory-Spec Tire Size
Varies by trim
2D Pickup Extra Cab, 2.3 A, 4WD: P195/75R15
2D Pickup Extra Cab, 2.3 A, RWD, Automatic: P195/75R14
2D Pickup Extra Cab, 2.3 A, RWD, Standard: P195/75R14
2D Pickup Extra Cab, 2.3 E: P195/75R14
2D Pickup Extra Cab, 2.9 T, 4WD, Automatic: P195/75R15
2D Pickup Extra Cab, 2.9 T, 4WD, Standard: P195/75R15
2D Pickup Extra Cab, 2.9 T, RWD, Automatic: P195/75R14
2D Pickup Extra Cab, 2.9 T, RWD, Standard: P195/75R14