Car Tyres Information

 

Information on car tires

Tires are made from white rubber obtained from trees

But the addition of carbon black chemical turns the color of the tire black

Carbon black keeps the tire cool and also protects the tire from the effects of ultraviolet rays and ozone. Carbon black mixed with rubber adds strength and power to the tire

Meaning and information of the readings on the tire

First is the 195 tire width

Another 55 is the height of the tire

The third is the 16 tire size ie 16 inches

The fourth is the 87 load index, which means how much load the tire can handle

The fifth is the speed limit of the tire, how fast the tire can go

The tire serial etc. is written below it

The last four digits of this serial indicate the tire's manufacturing date, the first two digits indicate the week of the year it was manufactured, while the last two digits indicate the year, as here 07 means 2007.

Tire maintenance safety

Always keep the air in the tire even and full

Maintain proper vehicle alignment and balancing

Check tires regularly for excessive wear or wear on one side

Note that leaving the handle completely free causes the vehicle to turn sideways or go straight

When installing new tires, check that the tires are not too old

Do not take tires that are more than three years old. The maximum age of tires is five to six years

If the tread of the tire penetrates even up to 2.5mm, replace the tire.

Speedometer and tire size difference

A vehicle's speedometer is actually set to engine RPM and tire size. But when we change the tire size of the car, the actual speed and meter reading of the car will be different, for example if your car tire size is 175/65/15 and you change it to 195/65/ If 15 size tires are installed, then if the speed of the vehicle was 120 km on the old tire, now with the new tire its speed will be 125 km. But the meter will still be showing 120. Moreover, you can also compare the speed of the vehicle with the speed of Google Map.

In case Changing Tire size from 175 to 195?

Changing your car’s tire size from 175 to 195 can have several effects on various aspects of your vehicle’s performance, including fuel efficiency, odometer readings, RPM (revolutions per minute), and speed. Here's how the change might impact each of these factors:

1. Mileage (Fuel Efficiency)

• Effect on Petrol per Liter:
• Wider tires (195mm) generally increase rolling resistance, meaning the engine has to work harder to move the vehicle. This can lead to reduced fuel efficiency.
• The extent of fuel efficiency reduction depends on driving conditions and habits, but you may see a slight decrease in miles per litre, especially in city driving where stop-and-go traffic requires more power.
• However, on highways or smooth roads, the difference might be less noticeable.

2. Running Kilometer Measurements (Odometer Reading)

• Effect on Odometer:
• The circumference of a 195mm tire is usually larger than that of a 175mm tire, which means that for every rotation of the tire, the car will cover more ground.
• This can cause your odometer and trip meter to underreport the actual distance traveled. For example, if your car's system is calibrated for 175mm tires, it may show you have traveled fewer kilometers than you actually have.

3. RPM (Revolutions Per Minute)

• Effect on RPM:
• Since a larger tire has a greater circumference, your car’s engine will require fewer revolutions to cover the same distance compared to the smaller 175mm tires.
• As a result, at a given speed, your engine RPM will likely decrease slightly, which could theoretically reduce engine wear and improve fuel economy at highway speeds, though this may not fully offset the increase in rolling resistance.

4. Speed

• Effect on Speedometer Accuracy:
• Since larger tires cover more distance per rotation, your actual speed may be higher than what your speedometer shows. For instance, if the speedometer is calibrated for 175mm tires, it will underreport the speed when running on 195mm tires.
• In practice, this means when your speedometer reads 60 km/h, you may actually be traveling faster (e.g., 62-65 km/h depending on the size difference).

Summary of Effects:

• Fuel Efficiency: Slight decrease due to increased rolling resistance.
• Odometer Reading: Underreporting actual distance traveled.
• RPM: Decreases at the same speed due to the larger circumference of the tire.
• Speed: Actual speed is higher than what the speedometer shows.

To get a precise idea of the changes, you might need to check the rolling circumference and make appropriate speedometer adjustments if necessary.

Affects in Figures

Step 1: Calculate the Tire Circumference

The formula for the circumference of a tire is:

Circumference=π×Diameter\text{Circumference} = \pi \times \text{Diameter}Circumference=π×Diameter

The diameter can be calculated as:

Diameter=Rim Diameter+2×Tire Height\text{Diameter} = \text{Rim Diameter} + 2 \times \text{Tire Height}Diameter=Rim Diameter+2×Tire Height

The tire height is a product of the width and aspect ratio (which is usually the percentage of the width). Without knowing the aspect ratio and rim size, I'll assume a typical ratio of 65 for 175 tires and 60 for 195 tires. Let me do the calculations and give you the effects.

Here are the effects based on the change from 175 to 195 tires:

• Old Tire Circumference: 1911.66 mm
• New Tire Circumference: 1932.08 mm
• Circumference Change: +1.07% (the new tire is about 1.07% larger)

Effects:

1. Speed: Your actual speed will be about 1.07% higher than what the speedometer shows. For example, if your speedometer reads 100 km/h, your actual speed would be approximately 101.07 km/h.
2. Odometer Reading: The odometer will underreport the distance by about 1.06%. For every 100 km the odometer records, you would have actually traveled around 101.06 km.
3. RPM: Your engine's RPM will decrease slightly by 1.06%, meaning fewer revolutions are needed to maintain the same speed.