Right Tyre Pressure Fleetable

Find out the right Tyre pressure for your vehicle type.
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Keep your tires at the optimal pressure to maintain your tires’ performance.
The tire pressure affects the safety of a driver on the road. So you can imagine what a bad tire can do to a vehicle.  When a tire is underinflated, a lot of things will be affected. One of them is the fuel efficiency. There will be a severe impact on the whole tire.
So, it’s important to find the right tire pressure as it is an essential element for properly functioning tires, enabling passengers and/or the load to be carried in a way that is:
  • Safe
  • Reliable
  • Economical
  • Comfortable
However, tire is one of the most neglected maintenance issues by users and mechanics alike.

TIRE INFLATION BASICS. PROPER INFLATION: THE MOST IMPORTANT STEP OF TIRE MAINTENANCE.

Today, many of your tire problems can be prevented by more careful attention paid to proper air pressure levels. Any given tire or inner tube is not completely impervious to a drop in air level. It’s important as a driver or maintenance to regularly check the correct air level for your varieties of truck as it may differ depending on weather conditions as well as other factors such as extra weight.

HOW TO WEIGH YOUR TRUCK

The safest way to estimate the weight your vehicle can safely carry is to use a scale. If you aren’t using a scale, it is important to weigh each of the axles separately based on the suggested weights listed in your vehicle’s owner’s handbook or manual.
You should also look at the accuracy of your tire’s treads and information listed in your car manufacturer’s tire data book from when you bought the tires from when they were new. Pay special attention to all 4 tires since they will likely be different from one another even if they are from the same brand and similar in specifications. This is especially true when dealing with larger trucks or trailer tires.

4x2 Rigid Truck

10.00R20 16PR 146/143 K

295/90R20 152/148 J

Payload (MT) Recommended Air Pressure (psi) -Cold
Front Axle
Rear Axle
13
120
140
15
130
155
18
140
175

6x2 Rigid Truck

10.00R20 16PR 146/143 K

295/90R20 152/148 J

Payload (MT) Recommended Air Pressure (psi) -Cold
Front Axle
Rear Axle (Driver/Dummy)
22
120
140
25
125
145
30
135
165
35
145
175

6x2 /6x4 Tripper/Mixer

10.00R20 16PR 146/143 K

295/90R20 152/148 J

Payload (MT) Recommended Air Pressure (psi) -Cold
Front Axle
Rear Axle (Driver/Dummy)
22
130
140
25
140
155
30
150
165
35
150
175

8x2x2 Lift Axle MA Truck

10.00R20 16PR 146/143 K

295/90R20 152/148 J

Payload (MT) Recommended Air Pressure (psi) -Cold
Front Axle
Lift Axle
Rear Axle (Driver/Dummy)
27
120
150
150
30
125
155
155
35
130
165
165

8x2x4 Twin Steer MA Truck

10.00R20 16PR 146/143 K

295/90R20 152/148 J

Payload (MT) Recommended Air Pressure (psi) -Cold
Front Axle
Lift Axle
Rear Axle (Driver/Dummy)
27
120
130
140
30
125
135
150
35
135
145
160

6x2 Luxury Coaches

295/80R22.5

Bus Type Recommended Air Pressure (psi) -Cold
Front Axle
Rear Axle
Pusher/Puller Axle
Luxury Coaches (Tubeless)
110
120
115


10x2x4 Twin Streer + Lift MA Truck - 14 wh - 5 Axle

10.00R20 16PR 146/143 K

295/90R20 152/148 J

Payload (MT) Recommended Air Pressure (psi) -Cold
Front Axle
2nd Streer Axle
Lift Axle
Rear Axle (Driver/Dummy)
35
130
135
135
145
40
135
140
145
155
45
140
145
155
165


12x2x4 Twin Streer + Lift MA Truck - 16 wh - 6 Axle

10.00R20 16PR 146/143 K

295/90R20 152/148 J

Payload (MT) Recommended Air Pressure (psi) -Cold
Front Axle
2nd Streer Axle
Lift Axle
Rear Axle (Driver/Dummy)
40
130
135
120
145
45
135
140
130
155
50
140
145
140
165

Pressure and Safety

Improper tire pressure can negatively impact fundamental safety features, such as:

  • The strength of the carcass
  • Vehicle stability and handling
  • Vehicle grip
  • Resistance “curb bumps”

Change in Tire Pressure

During operation, tires can lose pressure for various reasons:

  • Rim sealing (e.g., cracks or welds)
  • Cuts or perforations
  • Natural permeation through tire parts

In addition to in-vehicle control systems, visual inspection and periodic pressure checks with a pressure gauge is the most common way of detecting possible air loss problems.

Check Your Tire Pressure

Inspection must include all tires on the vehicle (including the spare tire)

  • Insufficient tire pressure leads to an abnormal rise in the operating temperature and may cause deterioration of internal parts. This deterioration is irreversible and may cause the tire failure with rapid air loss.  Consequences of driving with insufficient tire pressure may not be immediately visible and may become apparent even after an issue has been corrected.
  • Insufficient tire pressure also increases the risk of hydroplaning or possible accident. 
  • Over inflation can cause rapid and uneven wear and an increased probability of road hazard damage (tread damage, carcass breakage).
  • Using Nitrogen does not reduce the need to check tire pressure frequently (at least once a month).

In all cases, the air pressure recommended by the vehicle or tire manufacturer must be followed. Tire pressure should always be adjusted to load and specific tire use.

Important Precautions

  • Check air pressure when tires are cold.
  • Tire pressure increases while driving; never deflate the pressure of a hot tire.
  • Never reflate a tire that has been under-inflated without a thorough internal/external inspection of the tire.
  • Cold tire pressure higher than 145 psi is not recommended.
  • If cold tire pressure is over 8 psi the recommended pressure, tire pressure should be corrected immediately.
  • In all cases, comply with local regulations and laws.
  • Use an accurate, calibrated pressure gauge and handle with care.
  • If a tire checked in warm conditions has a lower pressure than recommended, the tire must be disassembled and checked in accordance of safety instructions.
  • If one tire appears significantly hotter than the others, it must be dismantled and checked following the same safety instructions.
  • Tire air pressure on the same axle should normally be of the same pressure (depending on tire size).
  • Tire pressure must be checked 24 hours after installation and must not be more than 5 % lower than the original pressure.
  • Follow tire pressure recommended by the vehicle manufacturer or manufacturer of your tires.

Impact of Tire Pressure on Mileage

Under-inflation of 22 psi = 10% yield loss   

Impact of Tire Pressure on Fuel Consumption

Tire pressure has a proven impact on fuel consumption. Incorrect tire pressure increases tire rolling resistance impacting the vehicle’s fuel consumption.

Under-inflation of 22 psi = 1 % increased consumption
For example, tire pressure at 109 psi for a tire that should be at 131 psi (17% under inflated) can impact fuel consumption up to 1%. 

 

Resources: Apollo tires, Cars24, Michelin

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