The 1989 Dodge Ram Van tire size depends on trim: the B150, 3.9 X, Automatic, A500 takes P195/75R15; the B150, 3.9 X, Automatic, A998 takes P195/75R15; the B150, 3.9 X, Standard takes P195/75R15; the B150, 5.2 Y, A500 takes P195/75R15; the B150, 5.2 Y, A727 takes P195/75R15; the B150, 5.2 Y, A999 takes P195/75R15; the B250, Van Cargo Extended, 3.9 X, A500 takes P235/75R15 108S XL; the B250, Van Cargo Extended, 3.9 X, A998 takes P235/75R15 108S XL; the B250, Van Cargo Extended, 5.2 Y, A500 takes P235/75R15 108S XL; the B250, Van Cargo Extended, 5.2 Y, A727 takes P235/75R15 108S XL; the B250, Van Cargo Extended, 5.2 Y, A999 takes P235/75R15 108S XL; the B250, Van Cargo Extended, 5.9 Z takes P235/75R15 108S XL; the B250, Van Cargo, 3.9 X, Automatic, A500 takes P225/75R15; the B250, Van Cargo, 3.9 X, Automatic, A998 takes P225/75R15; the B250, Van Cargo, 3.9 X, Standard takes P225/75R15; the B250, Van Cargo, 5.2 Y, A500 takes P225/75R15; the B250, Van Cargo, 5.2 Y, A727 takes P225/75R15; the B250, Van Cargo, 5.2 Y, A999 takes P225/75R15; the B250, Van Cargo, 5.9 Z takes P225/75R15; the B350, Van Cargo Extended, 5.2 Y takes LT245/75R16 E; the B350, Van Cargo Extended, 5.9 Z takes LT245/75R16 E; the B350, Van Cargo, 5.2 Y, A500 takes LT225/75R16 D; the B350, Van Cargo, 5.2 Y, A727 takes LT225/75R16 D; the B350, Van Cargo, 5.9 Z takes LT225/75R16 D, per the factory service manual.
Factory-Spec Tire Size
Varies by trim
B150, 3.9 X, Automatic, A500: P195/75R15
B150, 3.9 X, Automatic, A998: P195/75R15
B150, 3.9 X, Standard: P195/75R15
B150, 5.2 Y, A500: P195/75R15
B150, 5.2 Y, A727: P195/75R15
B150, 5.2 Y, A999: P195/75R15
B250, Van Cargo Extended, 3.9 X, A500: P235/75R15 108S XL
B250, Van Cargo Extended, 3.9 X, A998: P235/75R15 108S XL
B250, Van Cargo Extended, 5.2 Y, A500: P235/75R15 108S XL
B250, Van Cargo Extended, 5.2 Y, A727: P235/75R15 108S XL
B250, Van Cargo Extended, 5.2 Y, A999: P235/75R15 108S XL
B250, Van Cargo Extended, 5.9 Z: P235/75R15 108S XL
B250, Van Cargo, 3.9 X, Automatic, A500: P225/75R15
B250, Van Cargo, 3.9 X, Automatic, A998: P225/75R15
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