Subaru 2009 Impreza User Manual download pdf (Page 348)

Tires and wheels

& Types of tires

You should be familiar with type of tires

present on your vehicle.

! All season tires

All season tires are designed to provide

an adequate measure of traction, handling

and braking performance in year-round

driving including snowy and icy road

conditions. However all season tires do

not offer as much traction performance as

winter (snow) tires in heavy or loose snow

or on icy roads.

All season tires are identified by “ALL

SEASON” and/or “M+S” (Mud & Snow) on

the tire sidewall.

! Summer tires

Summer tires are high-speed capability

tires best suited for highway driving under

dry conditions.

Summer tires are inadequate for driving

on slippery roads such as on snow-

covered or icy roads.

If you drive your vehicle on snow-covered

or icy roads, we strongly recommend the

use of winter (snow) tires.

When installing winter tires, be sure to

replace all four tires.

! Winter (snow) tires

Winter tires are best suited for driving on

snow-covered and icy roads. However

winter tires do not perform as well as

summer tires and all season tires on roads

other than snow-covered and icy roads.

& Tire pressure monitoring

system (TPMS) (if equipped)

The tire pressure monitoring system pro-

vides the driver with a warning message

by sending a signal from a sensor that is

installed in each wheel when tire pressure

is severely low. The tire pressure monitor-

ing system will activate only when the

vehicle is driven. Also, this system may

not react immediately to a sudden drop in

tire pressure (for example, a blow-out

caused by running over a sharp object).

If you adjust the tire pressures in a warm

garage and will then drive the vehicle in

cold outside air, the resulting drop in tire

pressures may cause the low tire pressure

warning light to illuminate. To avoid this

problem when adjusting the tire pressures

in a warm garage, inflate the tires to

pressures higher than those shown on the

tire placard. Specifically, inflate them by an

extra 1 psi (6.9 kPa, 0.07 kgf/cm

2

) for

every difference of 108F (5.68C) between

the temperature in the garage and the

temperature outside. By way of example,

the following table shows the required tire

pressures that correspond to various out-

side temperatures when the temperature

in the garage is 608F (15.68C).

Example:

Tire size: P205/55R16 89V and

P205/50R17 88V

Standard tire pressures:

Front: 33 psi (230 kPa, 2.3 kgf/cm

2

)

Rear: 32 psi (220 kPa, 2.2 kgf/cm

2

)

Garage temperature: 608F (15.68C)

Outside

temperature

Adjusted pressure

[psi (kPa, kgf/cm

2

)]

front rear

308F(−18C) 36 (250, 2.5) 35 (240, 2.4)

108F(−128C)

38

(265, 2.65)

37

(255, 2.55)

−108F(−238C) 40 (280, 2.8)

39 (270, 2.7)

If the low tire pressure warning light

illuminates when you drive the vehicle in

cold outside air after adjusting the tire

pressures in a warm garage, re-adjust the

tire pressures using the method described

above. Then, increase the vehicle speed

to at least 20 mph (32 km/h) and check to

see that the low tire pressure warning light

turns off a few minutes later. If the low tire

pressure warning light does not turn off,

Maintenance and service 11-33

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