The speed unit we see in the vehicles is km / h, but the speed meters calculate the road speed according to the number of revolutions or revolutions. For this reason any change in tire size directly affects the indicated speed. To give an example of this situation;
Calculation of tire circumference and diameter 205/55 R 16
If the 205/50/16 tire size is preferred on a vehicle with a size of 205/55/16, the tire diameter will decrease. The speed indicator also starts to show a higher speed than ever before, as the number of laps per lane of descending tire will increase.
The circumference of the 205/55/16 tire is 198.4cm - it makes 507 turns at kilometer
205/50/16 tire circumference 192.2cm - makes 523 turns at kilometer
A speed difference of 3.2% occurs between the two tires. The difference is that the actual speed is 96.8km / h, which means that the display is overshadowed.
If the 205/60/16 tire size is used instead of the 205/55/16 tire size, the increase in tire size will be the opposite. The speed indicator starts to show a lower speed because the incremental lane of the tire will decrease the number of laps per km.
The circumference of the 205/55/16 tire is 198.4cm - 507 rounds per round
205/60/16 tire circumference 204.7cm - 491 rounds per round
A speed difference of 3.2% occurs between the two tires. The result of this difference is a real speed of 103.2 km / h with a display of 100 km / h.
What do the phrases on car tires mean?
Here is also the impact of the mileage calculator, which calculates the total route made. The small tires show more mileage, so the mileage counters make more. On the other hand, the bigger the tires, the less the mileage counter, the less the car makes. There are approximately 6.4% errors between 205/50/16 and 205/60/16 tires we have evaluated, and this difference corresponds to 6400 km difference over 100.000 km. This means that the vehicle that uses 205/60/16 size tire shows that the mileage calculator made 93,600km road while actually making 100.000km. In this respect, it is more advantageous to use the tire with the largest diameter proposed by the manufacturer, since it will show less mileage.