What size tires are on the IS 350?
There isn’t a single tire size for every IS 350—the size depends on the model year and trim. In recent generations, 18- and 19-inch wheel setups are most common, with typical factory sizes around 235/40R18 front and 265/40R18 rear, or 235/40R19 front and 265/35R19 rear. Some older trims used smaller wheels with different profiles.
Understanding IS 350 tire sizing
Tire size on the IS 350 is determined by several factors, including wheel diameter, trim level, and whether the car is equipped with an all-wheel drive system, a sport package, or aftermarket wheels. The tire placard located on the door jamb lists the exact sizes recommended by Lexus for your specific vehicle, and the owner's manual also provides OE sizing information.
Common wheel sizes for recent IS 350 models
Here are representative OEM configurations used on many IS 350 models in the last decade. Always verify against the placard on your car or the official Lexus specifications for your exact year and trim.
- 18-inch wheels: typically 235/40R18 (front) and 265/40R18 (rear).
- 19-inch wheels: typically 235/40R19 (front) and 265/35R19 (rear).
Older IS 350 configurations sometimes used 17-inch wheels or other wheel/tire combinations depending on the market and package. To ensure accuracy for your vehicle, consult the door jamb placard or your owner's manual.
Older IS 350 configurations (pre-recent generations)
In earlier generations or certain trims, 17-inch wheels were more common, with tire sizes varying by market and package. If you own a vintage IS 350, check the specific OE size listed in your documentation or on the tire sidewalls.
How to confirm your exact tire size
To be certain of the tire size currently installed on your IS 350, use the following steps.
- Inspect the sidewall of each tire for the size code (for example, 235/40R18). Note that front and rear tires can differ on some configurations.
- Look at the door‑jamb placard, which shows the recommended tire size for your vehicle as built, along with inflation pressures.
- Consult the owner's manual or Lexus’s official site/dealer resources to confirm the original equipment size for your year and trim.
- If you’ve changed wheels or suspension, ensure the new tires maintain proper clearance and load/speed ratings for safe operation.
Accurate tire sizing supports safety, handling, and warranty considerations.
Summary
In short, the IS 350 does not use a single tire size. Size varies by year, trim, and wheel choice. For the latest models, 18-inch wheels commonly use 235/40R18 front and 265/40R18 rear, while 19-inch wheels commonly use 235/40R19 front and 265/35R19 rear. Always verify with the vehicle’s placard or manual, especially if you’re dealing with aftermarket wheels or a different trim. If you share your exact year and trim, I can pinpoint the precise OE tire size for your car.
