Tire size determines the width, sidewall height and wheel diameter of a tire. A size such as 225/45R17 means 225 mm width, 45% aspect ratio and 17 inch rim diameter.
Changing tire size affects speedometer accuracy, acceleration, fuel economy, suspension geometry and ride comfort. Even small diameter changes can impact ABS and traction control systems.
When tire diameter increases, each wheel rotation covers more distance. Your car may travel faster than the speedometer shows. Smaller tires create the opposite effect.
Oversized tires may rub fenders, reduce steering clearance or increase drivetrain stress. Staying within 1% to 3% difference is usually safer.
Can I use 245 instead of 225?
It depends on wheel width, suspension and clearance.
Is 3% tire size difference safe?
Usually considered the upper safe limit.
Do bigger tires affect mileage?
Yes, heavier tires can reduce fuel economy.
Can tire size affect ABS?
Yes, major changes may impact ABS calibration.