Tire Pressure Lab

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# Tire Pressure Lab - PowerPoint PPT Presentation

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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## PowerPoint Slideshow about 'Tire Pressure Lab' - tariana

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Presentation Transcript

### 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