Subaru Forester: Tires and wheels / Tire pressures and wear

Maintaining the correct tire pressures helps to maximize the tires’ service lives and is essential for good running performance. Check and, if necessary, adjust the pressure of each tire and the spare (if equipped) at least once a month and before any long journey.

Subaru Forester. Tire pressures and wear

Tire placard

Check the tire pressures when the tires are cold. Use a pressure gauge to adjust the tire pressures to the values shown on the tire placard. The tire placard is located on the door pillar on the driver’s side.

Driving even a short distance warms up the tires and increases the tire pressures. Also, the tire pressures are affected by the outside temperature. It is best to check tire pressure outdoors before driving the vehicle.

When a tire becomes warm, the air inside it expands, causing the tire pressure to increase. Be careful not to mistakenly release air from a warm tire to reduce its pressure.

NOTE

  • The air pressure in a tire increases by approximately 4.3 psi (30 kPa, 0.3 kgf/cm2) when the tire becomes warm.
  • The tires are considered cold when the vehicle has been parked for at least three hours or has been driven less than 1 mile (1.6 km).

WARNING

Do not let air out of warm tires to adjust pressure. Doing so will result in low tire pressure.

Incorrect tire pressures detract from controllability and ride comfort, and they cause the tires to wear abnormally.

Subaru Forester. Tire pressures and wear

  1. Correct tire pressure (tread worn evenly)

    Roadholding is good, and steering is responsive. Rolling resistance is low, so fuel consumption is also lower.

  2. Under inflated tire (tread worn on shoulders)

    Rolling resistance is high, so fuel consumption is also higher.

  3. Over inflated (tread worn in the center)

    Ride comfort is poor. Also, the tire magnifies the effects of road-surface bumps and dips, possibly resulting in vehicle damage.

If the tire placard shows tire pressures for the vehicle when fully loaded, adjust the tire pressures to the values that match the loading conditions.

WARNING

Driving at high speeds with excessively low tire pressures can cause the tires to deform severely and to rapidly heat up. A sharp increase in temperature could cause tread separation and destruction of the tires. The resulting loss of vehicle control could lead to an accident.

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