What is rolling circumference? How much can it be changed?

Rolling Circumference and Safety

There are few components on your car that are as directly related to both performance and safety as tires. One of the most important characteristics of a tire is its rolling circumference. Rolling circumference is the length that a tire moves forward in each revolution. Understanding what circumference is and why it's important not to change it too much is crucial to keeping our vehicles safe and in good condition.

Wear Affects Rolling Circumference

The depth of the tire tread has some impact on the rolling circumference of your tires. When the tire is new, it has a specific rolling circumference determined by the manufacturer. As the tire wears down, the circumference decreases slightly. If you always make sure to replace your tires when they approach the minimum recommended tread depth, this change in circumference is only marginal.

Changed Rolling Circumference

The most common reason for a change in rolling circumference is switching to a smaller or larger tire than what is recommended by the vehicle's manufacturer. You can use the tool below if you want to know which tires are recommended for your specific car:

Consequences of Incorrect Rolling Circumference

It is not recommended to install a tire with a rolling circumference that deviates by more than +-5%. If the deviation is higher, it can lead to one or more of the following consequences:

1. Speedometer and Vehicle Performance: The car or vehicle's speedometer is calibrated to work with the specific tire's rolling circumference. If you change the rolling circumference by switching to tires with a different diameter or tread depth, it can result in incorrect speed readings on your gauge. It can also affect other aspects of the vehicle's performance, such as acceleration and fuel consumption.

2. Vehicle Dynamics and Stability: The tire's rolling circumference also affects the dynamics and stability of the vehicle. When you change the rolling circumference, it can impact the vehicle's height and balance, which can result in poorer grip and handling. It can also increase the risk of wear on other parts of the vehicle, such as the suspension.

3. ABS and ESP Systems: Many modern vehicles are equipped with anti-lock braking systems (ABS) and electronic stability control (ESP) that rely on the tire's rolling circumference being within a certain tolerance range. If the rolling circumference changes too much, it can cause incorrect operation of these systems, which in turn can affect your ability to handle and control the vehicle in emergency situations.

4. Extended Tire Lifespan: Changing the rolling circumference by using tires with an incorrect diameter can lead to uneven tire wear. This can shorten the lifespan of the tires and mean that you need to replace them more often, which can be an unnecessary financial burden.

ORIGINAL TYRES

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NEW TYRES

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Rolling Circumference

Rolling Circumference

Rolling Circumference and Safety

Wear Affects Rolling Circumference

Changed Rolling Circumference

Tyre Look-up tool

Consequences of Incorrect Rolling Circumference

Rolling Circumference Calculator

Result

Is it important to have the correct rolling circumference?

How do I know if the tire's rolling circumference deviates by more than 5%?

Can I have different rolling circumferences on the front and rear axles?

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