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Tire Pressure Lab

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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  1. Tire Pressure Lab

  2. 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.

  3. 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.

  4. Tire Pressure Gauges

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

  6. 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

  7. Contact Patch cont…. • Units: in2 • Under or over inflated tires may result in an incorrect contact patch area!!

  8. Aspect Ratio • Def: A comparison of the tire height to width • Formula:

  9. Aspect Ratio cont…. • Low number= Low Profile Tire Greater width than height

  10. 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)

  11. Rim Size in inches Aspect Ratio Type of tire Width in mm Tire Serial Numbers • P 185 80 R 14

  12. Tire Serial Numbers cont…

  13. Data Table

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