Chevrolet Sonic Repair Manual: Tire Inflation Description

Chevrolet Sonic Repair Manual / Chassis / Wheels/Tires / Wheels / Tire Inflation Description

When you inflate the tires to the recommended inflation pressures, the factory-installed wheels and tires are designed in order to handle loads to the tire's rated load capacity. Incorrect tire pressures, or under-inflated tires, can cause the following conditions:

Vehicle handling concerns
Poor fuel economy
Shortened tire life
Tire overloading

Inspect the tire pressure when the following conditions apply:

The vehicle has been sitting at least 3 hours.
The vehicle has not been driven for more than 1.6 km (1 mi).
The tires are cool.

Inspect the tires monthly or before any extended trip. Adjust the tire pressure to the specifications on the tire label. Install the valve caps or the extensions on the valves. The caps or the extensions keep out dust and water.

The kilopascal (kPa) is the metric term for pressure. The tire pressure may be printed in both kilopascal (kPa) and psi. One psi equals 6.9 kPa.

Inflation Pressure Conversion (Kilopascals to PSI)
kPa	psi	kPa	psi
140	20	215	31
145	21	220	32
155	22	230	33
160	23	235	34
165	24	240	35
170	25	250	36
180	26	275	40
185	27	310	45
190	28	345	50
200	29	380	55
205	30	415	60
Conversion: 6.9 kPa = 1 psi

Tires with a higher than recommended pressure can cause the following conditions:

A hard ride
Tire bruising
Rapid tread wear at the center of the tire

Tires with a lower than recommended pressure can cause the following conditions:

A tire squeal on turns
Hard steering
Rapid wear and uneven wear on the edge of the tread
Tire rim bruises and tire rim rupture
Tire cord breakage
High tire temperatures
Reduced vehicle handling
High fuel consumption
Soft riding

Unequal pressure on the same axle can cause the following conditions:

Uneven braking
Steering lead
Reduced vehicle handling

Refer to the Tire Placard for specific tire and wheel applications and tire pressures.

Tire Dismounting and Mounting (Match Mounting)

Match mounting is required on any wheel/tire assembly not within RFV specification. Important: If a wheel/tire assembly is not within the RFV specification after match mounting, the ti ...

Tire Inspection

We recommend that the tires, including the spare tire, if the vehicle has one, be inspected for signs of wear or damage at least once a month. Replace the tire if: The indicators at three or ...

Other materials:

Rear Seat Center Shoulder Belt Replacement (Hatchback)
Rear Seat Center Shoulder Belt Replacement Callout Component Name Preliminary Procedures Remove the rear seat cushion. Refer to Rear Seat Cushion Removal and Installation. Remove the rear seat back cushion. Refer to Rear ...

Brake System External Leak Inspection
Warning: Refer to Brake Fluid Irritant Warning. Caution: Refer to Brake Fluid Effects on Paint and Electrical Components Caution. In order to inspect for external brake fluid leaks, first inspect the fluid level in the master cylinder. While a slight brake fluid level drop c ...

Intake Camshaft Removal
Remove the camshaft bearing cap bolts in a spiral sequence as shown one turn at a time until there is no spring tension pushing on the camshaft. Note: Mind the markings on the camshaft bearing caps to ensure they will be installed in the same position. Remove the ...

0.0066