What size tyres are on a Lexus IS350?
The tyre size on a Lexus IS350 is not fixed; it varies by year, trim and wheel package.
Across its generations, Lexus offered different wheel options and tyres to match performance, ride comfort and market requirements. To know the exact size for a specific car, you must check the car's placard, user manual, or VIN-based specification data. This article explains how to identify the correct tyre size and what ranges you might encounter on common IS350 configurations.
How to find your exact tyre size
To confirm the precise tyre size for your vehicle, use these reliable sources:
- Door placard on the driver's door jamb – lists the standard tyre size and recommended cold inflation pressures.
- Owner's manual – contains the official specification for tyres and wheels for your model year and trim.
- Tire sidewall – the numbers printed on the tire show its size (for example, P245/40R18). This indicates the size of the tire fitted to the wheel you’re currently using.
- VIN-based build sheet or Lexus owner portal – can confirm the original equipment tyre size based on your vehicle's VIN, useful if you’re buying used.
Using these sources will give you the exact OE tyre size and any alternate sizes recommended by Lexus for different wheels or packages. If you’ve replaced wheels with aftermarket sizes, verify that the selected tyres still meet load ratings and clearance requirements for your vehicle.
Typical wheel sizes and ranges for the IS350
In general, the IS350 has been offered with wheel sizes spanning from 17 to 19 inches, with corresponding tyres that vary by trim and market. The exact numbers depend on the model year, trim level, and whether the car uses standard or sport/touring packages.
Common IS350 wheel size categories include:
- 17-inch wheels
- 18-inch wheels
- 19-inch wheels
Actual tyre widths and aspect ratios vary by year and trim, so the numbers above are indicative rather than definitive. Always verify with the sources listed above for your specific vehicle.
Understanding tyre size codes
Tyre size codes follow a standard format printed on the sidewall, such as P225/40R18. The first number (235, for example) is the width of the tyre in millimetres. The middle number (40) is the aspect ratio, which represents the height of the sidewall as a percentage of the width. The final number (18) is the diameter of the wheel in inches. The letter at the beginning (P, LT, etc.) indicates the tyre type and vehicle category. These codes help you compare OE sizes and ensure replacements fit correctly.
Note that some IS350s—particularly those equipped with aftermarket wheels or regional packages—may use different sizes from the factory. Always confirm the exact OEM size for your vehicle before purchasing replacements.
Notes by year and trim
Over the IS350's production run, Lexus offered various wheel configurations tied to trim levels and markets. Lower trims often came with smaller wheels, while sportier and premium variants frequently used larger wheels and, in some cases, staggered front/rear sizes (front narrower than rear) on performance-oriented packages. If you’re evaluating a used IS350 or planning to swap wheels, verify the original equipment sizes for your specific model year and trim to ensure proper fitment, clearance, and safety.
For buyers or owners, the most reliable approach remains checking the door placard, owner’s manual, and, if needed, a dealership or VIN-based build sheet to confirm the exact tyre size for your car.
Summary
There is no universal tyre size for the Lexus IS350. The correct size depends on generation, trim, wheel package, and regional specifications. Always verify using the door placard, the owner's manual, the tire sidewall markings, or VIN-based data before replacing tires or wheels. This ensures safe operation, proper clearance, and optimal performance for your specific IS350.
