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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.

    • Read the gauge.


Tire Pressure Gauges


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


Tire Serial Numbers cont…


Data Table


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