What size tires are on a 2010 IS250?
Most 2010 Lexus IS250 models roll on 225/45R17 tires, with 235/40R18 tires used on vehicles equipped with the optional 18-inch wheel upgrade. Always verify the exact size on your car’s door jamb placard or owner’s manual, as packages and trims can change the specification.
Tire sizes by wheel option
Below are the tire sizes commonly associated with the 2010 IS250, depending on wheel size. This helps you identify what your specific vehicle should have installed from the factory.
- Standard 17-inch wheels: 225/45R17
- Optional 18-inch wheels: 235/40R18
For owners, confirming the correct size is important for performance, safety, and ride quality. If your car has different aftermarket wheels or a specialty package, the size may vary from the listed options.
What the numbers mean
Tire size notation like 225/45R17 conveys three key details: 225 is the tire width in millimeters, 45 is the aspect ratio (the height of the sidewall as a percentage of width), and 17 is the wheel diameter in inches. The R indicates radial construction. This simple code tells you how wide the tire is, how tall the sidewall is, and what wheel it fits.
Example interpretation
For 225/45R17, the tire is 225 mm wide, the sidewall height is 45% of 225 mm, and it fits a 17-inch wheel.
How to verify on your car
There are a few reliable ways to confirm the correct tire size for your specific IS250:
- Check the driver’s door jamb placard, which lists the recommended tire sizes for your trim and wheel setup.
- Consult the owner’s manual, which includes wheel and tire specifications for all model years and configurations.
- Inspect the sidewall of the tires currently installed on your car to confirm the exact size in use.
If you replaced wheels or tires after purchase, ensure the new size matches or is within the manufacturer’s acceptable range to maintain handling, speedometer accuracy, and safety.
Maintenance and replacement tips
When replacing tires on a 2010 IS250, consider keeping the same size across all four corners for balanced handling. If you upgrade to the 18-inch option, choose tires with a similar performance characteristic to preserve ride comfort and alignment geometry. Regularly check tire pressure and tread depth, rotate tires as recommended by Lexus, and replace tires in sets to maintain consistent grip.
Summary
In summary, the 2010 Lexus IS250 generally uses 225/45R17 tires with 17-inch wheels, and 235/40R18 tires if the vehicle is equipped with optional 18-inch wheels. Always verify the exact size on the vehicle’s placard or manual, especially if aftermarket wheels or packages are installed. Proper sizing supports safety, performance, and smooth driving dynamics.
