GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2000 🢒 Firebird 🢒 Suspension 🢒 Tires and Wheels 🢒 Tires Description

Object Number: 70080 Size: SH
    • A tire performance criteria (TPC) specification number is molded in the sidewall near the tire size of all original equipment tires.
    • The TPC specification number ensures that the tire meets GM's performance standards for the following conditions:
       - Traction
       - Endurance
       - Dimension
       - Noise
       - Handling
       - Rolling resistance
    • A specific TPC number is usually assigned to each tire size.
    • The following characteristics on replacement tires should be the same as on the original tires:
       - Load range
       - Speed Rating
       - Construction
    • Replace the original tires with tires of the same TPC specification number.
    • Use of any other tire size or type may affect the following conditions:
       - Ride
       - Handling
       - Speedometer/odometer calibration
       - Antilock brake system
       - Vehicle ground clearance
       - Tire clearance to body and chassis
    • Install new tires in pairs on the same axle.
    • If it is necessary to replace only one tire, the tire should be paired with the tire having the most tread in order to equalize the braking traction.

Replace the tires under the following conditions:

    • Tires are worn to a point where 1.6 mm (1.16 in) or less tread remains, or the cord fabric shows.
        To help detect this condition, tires have built-in tread wear indicators that appear between the tread grooves when the tread is worn to 1.6 mm (1/16 in) or less.
        Replace the tire when the indicators appear in two or more adjacent grooves at three spots around the tire.
    • The tread or sidewall is damaged in one of the following ways:
        The tread or sidewall is cracked or either cut or snagged deeply enough to expose the cord or the fabric.
       - The tread or sidewall is cracked.
       - The tread or sidewall is cut deeply enough in order to expose the cord or the fabric.
       - The tread or sidewall is snagged deeply enough in order to expose the cord or the fabric.
    • One of the following conditions exists in the tire:
       - A bump
       - A bulge
       - A split
       - Slight sidewall indentations are normal and should not affect the ride.
    • One of the following conditions exists in the tire:
       - A puncture
       - A cut
       - Other damage that cannot be correctly repaired because of the size or location of the damage.