Safety check category B

Tires

1. Check the tires and rims for damages
Look for signs of uneven wear, bulges or cracks, or embedded objects that could cause air leaks.

2. What are the most common tire damages?
The most common damages to tires and rims are tears and wounds on the side of the tire and bulges on the rim edge. This causes the resilience in the tire to be reduced. The tire can break while driving, which causes accidents.

3. Check the front tires for wear and tear.
Can you see the tread sensors? Are the tires worn out in the middle?

4. What can the tire wear tell you?
Improper inflation pressure leads to uneven wear on the tire. Overinflation wears on the centre rib. Underinflation wears on the shoulder rib. If the tire is worn only on one side, you should bring the car to a repair shop to check the heel/toe, camber and caster.

5. Check the tread depth on both rear tires
Use a tread depth gauge or a ruler to measure the tread depth where the tire is most worn. Measure in three different places, such as the edges and center of the tire. Make sure there are no bumps on the tire surface.

6. What are the risks of driving with tread depth under the legal limit?
You get a poorer grip on the road and increase the risk of aquaplaning.
7. What is the correct tire pressure for this car?
You can find the tire pressure specifications on a placard/label affixed to the driver’s door or along the door jam, or in the gas tank lid. You can also check your vehicle owner’s manual for tire pressure recommendations.
According to the label along the door jam the right air pressure for this car is
  • 1-3 passengers included luggage, 260 kPa in the front tires and 240 kPa in the rear tires.
  • 4-5 passengers included luggage, 260 kPa in the front tires and 260 kPa in the rear tires.
8. Check the tire pressure in the front wheels
Take a visual control or use a pressure gauge. If you do not have a pressure gauge they have it at the gas station. This is how you check the pressure.
  • Unscrew the valve cap
  • Check current pressure - place the filling gun at the valve. You should be able to see the current air pressure in the tires.
  • Fill to the correct level - If the air pressure is low, fill up a small amount of air at the time, until you reach the right tire pressure for your car.
The cars we use for our driving lessons have tire pressure warning, which means that if the tires have the wrong air pressure, a dashboard lamp will light up.

Tire pressure table
The tire pressure is usually stated in PSI, bar, kPA or kg / cm2. You can use this table for conversion if you need it.
9. What is the legal requirement for tire depth?
The lower threshold for snow tires is 3 mm, and 1.6 mm for summer tires. It is measured where the tire is worn the most.
10. What is the correct tire dimension for this car?
Check the vehicle registration certificate, under the column “Aksler / dekk / felger”, and see that the dimensions correspond to what is written on the side of the tires.

The vehicle card states that standard tire dimensions on axles 1 and 2 are 215/65R16
On the tire it says that the tire dimension is 215/55R18

This is what the marks on the tires mean:
215 stands for tire width in millimeters.
55 is the height of the tire as a percentage of width.
R stands for radial, and explains how the tire is constructed.
18 stands for the rim diameter in inches.
99 is load class, how much weight the tire can carry.
V is speed code. This tells the limit of how fast the tire is designed to drive.
In addition, the tires are marked m · s if they are winter tires.

The vehicle registration certificate states that there are alternative tire and rim dimensions you can use on this car. This means that the tire dimensions of this car are correct.
The deviation in rolling circumference can be a maximum of + -5% in relation to the standard tire dimension stated in the vehicle registration certificate.

11. What is the minimum load index for the tires on this car?
Check the Vehicle Registration Certificate, under “Min.LI” (Minimum Load Index). For this car it is 84.

12. Check that all the tires have the correct load index.
Check the Vehicle Registration Certificate (“Min. LI”) and then do a visual control. In the picture above we can see that it says 99V. That means that the tire has a load index for 99, which is higher than the minimum requirement of 84. The tires have therefore the correct load index.
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