What size tires does a 1999 Lexus GS 300 have?
The tire size for a 1999 Lexus GS 300 is not fixed across all cars; it varies with wheel size and trim. The most common factory configurations for that year were 225/60R15 on 15-inch wheels and 225/50R16 on 16-inch wheels.
Background on the 1999 GS 300
In the late 1990s, the Lexus GS 300 offered a range of wheel options that influenced the factory tire size. While most units shipped with smaller 15-inch wheels, higher-trim or sport-oriented configurations could be equipped with larger 16-inch wheels, and in some cases market-specific packages offered 17-inch wheels. Because tire size is tied to wheel diameter and trim, there isn’t a single universal size for every 1999 GS 300.
Common stock tire sizes by wheel option
Below are the sizes most often associated with the 1999 GS 300, split by typical wheel diameter. These reflect OEM equipment seen on many examples from that year, but exact figures can vary by market and individual configuration.
- 15-inch wheels: 225/60R15
- 16-inch wheels: 225/50R16
- 17-inch wheels (optional sport package in some markets): 235/45R17
These sizes represent common factory implementations. If your car has a different setup, your specific size may differ due to market, trim, or dealer-installed options. Always verify with the door placard or the owner's manual.
How to verify your exact size on your car
To confirm the precise tire size for your specific vehicle, use these steps. They will help you identify the OEM size originally installed or current tire sizing for replacement.
- Check the door jamb placard on the driver’s side for the official tire size and suggested inflation pressures.
- Consult the owner's manual or the original window sticker for the exact specification.
- Inspect the current tires’ sidewalls for the size marking to see what is installed now.
- If in doubt, contact a Lexus dealer and provide the VIN to retrieve the exact original equipment size for your car.
Verifying the exact size helps ensure replacements maintain the car’s handling, speedometer accuracy, and safety systems.
What to know when replacing tires for the GS 300
When replacing tires, it’s important to consider staying as close as possible to the OEM size or choosing a size that maintains the overall diameter. Using a different size can affect speedometer readings, traction control, ABS, and ride quality. If you choose a non-OEM size, consult a tire professional about fitment, wheel width/offset, and potential impacts on the vehicle’s systems. If you switch from 15" to 16" wheels, ensure the sidewall height is adjusted to preserve the overall diameter and maintain similar rolling circumference.
Summary
The 1999 Lexus GS 300 did not have a single universal tire size; it depended on wheel size and trim. Common OEM configurations included 225/60R15 on 15-inch wheels and 225/50R16 on 16-inch wheels, with some markets offering 17-inch wheels via sport-oriented packages. To confirm the exact size for your car, check the driver’s door placard, review the owner's manual, or consult a Lexus dealer with the VIN. When replacing tires, aim to match the original size or consult a professional to ensure compatibility with the vehicle’s systems and performance characteristics.
