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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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Presentation Transcript
goal of the 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
  • 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.
contact patch
Contact Patch
  • Def: The area of the tire that comes in contact with the pavement.
contact patch cont
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 cont7
Contact Patch cont….
  • Units: in2
  • Under or over inflated tires may result in an incorrect contact patch area!!
aspect ratio
Aspect Ratio
  • Def: A comparison of the tire height to width
  • Formula:
aspect ratio cont
Aspect Ratio cont….
  • Low number= Low Profile Tire

Greater width than height

weight of the car
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)

tire serial numbers
Rim

Size

in

inches

Aspect

Ratio

Type

of tire

Width

in

mm

Tire Serial Numbers
  • P 185 80 R 14
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