The 1991 Chevrolet Sportvan tire size depends on trim: the G10, 4.3 Z, 4L60/MD8 takes P205/75R15; the G10, 4.3 Z, 700R4/MD8 takes P205/75R15; the G10, 5.0 H, 4L60/MD8 takes P205/75R15; the G10, 5.0 H, 700R4/MD8 takes P205/75R15; the G10, 5.7 K, 4L60/MD8 takes P205/75R15; the G10, 5.7 K, 700R4/MD8 takes P205/75R15; the G20, 4.3 Z, 4L60/MD8 takes P225/75R15; the G20, 4.3 Z, 700R4/MD8 takes P225/75R15; the G20, 5.0 H, 4L60/MD8 takes P225/75R15; the G20, 5.0 H, 700R4/MD8 takes P225/75R15; the G20, 5.7 K, 4L60/MD8 takes P225/75R15; the G20, 5.7 K, 700R4/MD8 takes P225/75R15; the G20, 6.2 C, 4L60/MD8 takes P235/75R15; the G20, 6.2 C, 700R4/MD8 takes P235/75R15; the G30, Van Passenger Extended, 5.7 K takes LT225/75R16 D; the G30, Van Passenger Extended, 6.2 J takes LT225/75R16 D; the G30, Van Passenger Extended, 7.4 N takes LT225/75R16 D; the G30, Van Passenger, 5.7 K, 4L60/MD8 takes LT225/75R16 D; the G30, Van Passenger, 5.7 K, 4L80E/MT1 takes LT225/75R16 D; the G30, Van Passenger, 5.7 K, 700R4/MD8 takes LT225/75R16 D; the G30, Van Passenger, 6.2 J, 4L60/MD8 takes LT225/75R16 D; the G30, Van Passenger, 6.2 J, 4L80E/MT1 takes LT225/75R16 D; the G30, Van Passenger, 6.2 J, 700R4/MD8 takes LT225/75R16 D; the G30, Van Passenger, 7.4 N takes LT225/75R16 D, per the factory service manual.
Factory-Spec Tire Size
Varies by trim
G10, 4.3 Z, 4L60/MD8: P205/75R15
G10, 4.3 Z, 700R4/MD8: P205/75R15
G10, 5.0 H, 4L60/MD8: P205/75R15
G10, 5.0 H, 700R4/MD8: P205/75R15
G10, 5.7 K, 4L60/MD8: P205/75R15
G10, 5.7 K, 700R4/MD8: P205/75R15
G20, 4.3 Z, 4L60/MD8: P225/75R15
G20, 4.3 Z, 700R4/MD8: P225/75R15
G20, 5.0 H, 4L60/MD8: P225/75R15
G20, 5.0 H, 700R4/MD8: P225/75R15
G20, 5.7 K, 4L60/MD8: P225/75R15
G20, 5.7 K, 700R4/MD8: P225/75R15
G20, 6.2 C, 4L60/MD8: P235/75R15
G20, 6.2 C, 700R4/MD8: P235/75R15
G30, Van Passenger Extended, 5.7 K: LT225/75R16 D
G30, Van Passenger Extended, 6.2 J: LT225/75R16 D
G30, Van Passenger Extended, 7.4 N: LT225/75R16 D
G30, Van Passenger, 5.7 K, 4L60/MD8: LT225/75R16 D
G30, Van Passenger, 5.7 K, 4L80E/MT1: LT225/75R16 D
G30, Van Passenger, 5.7 K, 700R4/MD8: LT225/75R16 D
G30, Van Passenger, 6.2 J, 4L60/MD8: LT225/75R16 D
G30, Van Passenger, 6.2 J, 4L80E/MT1: LT225/75R16 D
G30, Van Passenger, 6.2 J, 700R4/MD8: LT225/75R16 D
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