Using the wrong tyre size may look like a small mistake, but it can silently cause many issues that affect your vehicle’s safety, comfort, and long-term durability. When the tyre diameter or width is not what the manufacturer recommends, the balance of the whole vehicle changes. This leads to unstable handling, poor grip, and a noticeable difference in the way the car responds, especially at high speeds or on wet roads. The braking system also gets affected because wrong-size tyres cannot distribute pressure properly, resulting in longer stopping distances and less effective ABS performance.

Not only that, but the suspension and wheel components also begin to wear out faster. Parts like shock absorbers, ball joints, and wheel bearings face extra stress because they are not designed to work with mismatched tyre sizes. Drivers may not notice it immediately, but this can lead to expensive repairs over time. Fuel efficiency also drops when using incorrect tyre sizes, as the engine works harder and the rolling resistance increases. Another hidden issue is incorrect speedometer readings, which can show wrong speeds and even affect functions like traction control and cruise control.

Using the wrong tyre size also increases the risk of uneven tyre wear and possible blowouts due to improper contact with the road. A blowout at high speed is extremely dangerous and can cause complete loss of control. On top of all this, insurance companies may consider wrong-size tyres as an unauthorised modification, which can lead to rejected claims or warranty issues. For all these reasons, sticking to the recommended tyre size is always the safest and most economical choice for every driver.