What size tires are on a 1999 Lexus LS400?
The typical tire size for a 1999 Lexus LS400 is P225/60R16 on 16-inch wheels; some cars built with 15-inch wheels used a front/rear combination of P205/65R15 (front) and P225/60R15 (rear).
Wheel size options
16-inch wheels
For the common late-1990s LS400 configuration, Lexus paired 16-inch wheels with a single tire size across the axle.
- P225/60R16 — used on all four corners
This 16-inch setup was the standard OE configuration on most 1999 LS400s that shipped with 16-inch wheels.
15-inch wheels
Some early builds or market-specific examples used 15-inch wheels, which required two different front/rear sizes.
- Front: P205/65R15
- Rear: P225/60R15
This staggered setup is less common on late-1999 production cars but may appear on certain regional or older-stock units.
How to verify your exact tire size
Because production variations and aftermarket changes exist, the definitive source is the door jamb placard and the owner's manual. The placard lists the recommended sizes for front and rear tires, along with the appropriate load index and speed rating. You can also read the tire’s sidewall, which will display the size in the format PXXX/XXRXX.
If your LS400 has aftermarket wheels or has been retreaded or re-tired, sizes may differ from the original equipment. Always match the replacement tires to the size recommended by Lexus for your specific vehicle’s year and wheel configuration.
Summary
In short, the standard OEM tire size on a 1999 Lexus LS400 with 16-inch wheels is P225/60R16. Some late-1999 cars or specific markets used 15-inch wheels with P205/65R15 (front) and P225/60R15 (rear). To be certain, check the driver’s door jamb placard or the owner's manual, especially if your car has been modified or is from a non-standard market.
