The 1991 Chevrolet Astro tire size depends on trim: the Van Cargo Extended, AWD, 4L60/MD8 takes P205/75R15; the Van Cargo Extended, AWD, 700R4/MD8 takes P205/75R15; the Van Cargo Extended, RWD, 4L60/MD8 takes P205/75R15; the Van Cargo Extended, RWD, 700R4/MD8 takes P205/75R15; the Van Cargo, AWD, 4L60/MD8 takes P205/75R15; the Van Cargo, AWD, 700R4/MD8 takes P205/75R15; the Van Cargo, RWD, 4L60/MD8 takes P205/75R15; the Van Cargo, RWD, 700R4/MD8 takes P205/75R15; the Van Passenger Extended, 4.3 B, 4L60/MD8 takes P205/75R15; the Van Passenger Extended, 4.3 B, 700R4/MD8 takes P205/75R15; the Van Passenger Extended, 4.3 Z, AWD, 4L60/MD8 takes P205/75R15; the Van Passenger Extended, 4.3 Z, AWD, 700R4/MD8 takes P205/75R15; the Van Passenger Extended, 4.3 Z, RWD, 4L60/MD8 takes P205/75R15; the Van Passenger Extended, 4.3 Z, RWD, 700R4/MD8 takes P205/75R15; the Van Passenger, 4.3 B, 4L60/MD8 takes P205/75R15; the Van Passenger, 4.3 B, 700R4/MD8 takes P205/75R15; the Van Passenger, 4.3 Z, AWD, 4L60/MD8 takes P205/75R15; the Van Passenger, 4.3 Z, AWD, 700R4/MD8 takes P205/75R15; the Van Passenger, 4.3 Z, RWD, 4L60/MD8 takes P205/75R15; the Van Passenger, 4.3 Z, RWD, 700R4/MD8 takes P205/75R15, per the factory service manual.
Factory-Spec Tire Size
Varies by trim
Van Cargo Extended, AWD, 4L60/MD8: P205/75R15
Van Cargo Extended, AWD, 700R4/MD8: P205/75R15
Van Cargo Extended, RWD, 4L60/MD8: P205/75R15
Van Cargo Extended, RWD, 700R4/MD8: P205/75R15
Van Cargo, AWD, 4L60/MD8: P205/75R15
Van Cargo, AWD, 700R4/MD8: P205/75R15
Van Cargo, RWD, 4L60/MD8: P205/75R15
Van Cargo, RWD, 700R4/MD8: P205/75R15
Van Passenger Extended, 4.3 B, 4L60/MD8: P205/75R15
Van Passenger Extended, 4.3 B, 700R4/MD8: P205/75R15
Van Passenger Extended, 4.3 Z, AWD, 4L60/MD8: P205/75R15
Van Passenger Extended, 4.3 Z, AWD, 700R4/MD8: P205/75R15
Van Passenger Extended, 4.3 Z, RWD, 4L60/MD8: P205/75R15
Van Passenger Extended, 4.3 Z, RWD, 700R4/MD8: P205/75R15
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