# Tire Pressure Lab - PowerPoint PPT Presentation

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Tire Pressure Lab. Goal of the Lab. Determine the average tire pressure for a passenger vehicle. Measure the contact patch of the tire. Calculate the aspect ratio of the tire. Use data from lab to determine weight of the car. Tire Pressure.

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Tire Pressure Lab

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## Tire Pressure Lab

### Goal of the Lab

• Determine the average tire pressure for a passenger vehicle.

• Measure the contact patch of the tire.

• Calculate the aspect ratio of the tire.

• Use data from lab to determine weight of the car.

### Tire Pressure

• Tire pressure measures the amount of air in your tire per unit volume.

• Units: lb/in2

• Method:

• Place gauge on uncovered valve stem and release air from tire into gauge.

### Contact Patch

• Def: The area of the tire that comes in contact with the pavement.

Back

Side

### Contact Patch cont….

• Method: Use a ruler to measure the area of the tire that is touching the ground.

Side x Back = Area

### Contact Patch cont….

• Units: in2

• Under or over inflated tires may result in an incorrect contact patch area!!

### Aspect Ratio

• Def: A comparison of the tire height to width

• Formula:

### Aspect Ratio cont….

• Low number= Low Profile Tire

Greater width than height

### Weight of the Car

• Weight is calculated from the contact patch and the tire pressure.

• Formula:

(Contact Patch in2 x 4 ) x (tire pressure lb/in2)

Rim

Size

in

inches

Aspect

Ratio

Type

of tire

Width

in

mm

### Tire Serial Numbers

• P 185 80 R 14