What size tires are on the IS 300?
There isn’t a universal tire size for the Lexus IS 300; the exact dimensions depend on the model year, trim level, and wheel package. The precise size for your vehicle is listed on the door jamb placard and on the tire sidewall.
Overview of typical IS 300 wheel sizes and tire pairs
Below are common tire size configurations used on IS 300 models with standard wheel options. Always verify for your specific vehicle, as trims and generations can vary.
- With 18-inch wheels: front 235/40R18 and rear 265/40R18
- With 19-inch wheels (often on higher trims or F Sport): front 235/35R19 and rear 265/35R19
- With 17-inch wheels (older or base configurations): front 235/45R17 and rear 255/45R17
These sizes reflect the most prevalent configurations seen in recent IS 300 models. Individual vehicles may differ; always confirm with the placard or owner's manual.
How to confirm your exact tire size
Use these checks to verify the precise tire size installed on your IS 300:
- Inspect the driver’s door jamb placard for the recommended OE tire size.
- Read the tire sidewall to locate the size code (for example, 235/40R18).
- Consult the owner’s manual or the Lexus VIN-based build sheet for the exact spec by year/trim.
Knowing the exact size ensures proper tire replacements, maintaining handling, ride quality, and speedometer accuracy.
Notes by generation and trim
Different generations and trims of the IS 300 used different wheel sizes, which in turn affect the tire dimensions. Some trims with larger wheels may use wider rear tires, while others stay closer to a symmetric setup. When replacing tires, you can opt for a size that preserves the overall diameter to avoid affecting accuracy of instruments and performance characteristics.
Summary
In short, there is no single tire size for the IS 300. Sizes vary by year, trim, and wheel option. Common current configurations include 235/40R18 front with 265/40R18 rear on 18-inch wheels, and 235/35R19 front with 265/35R19 rear on 19-inch wheels, with older configurations occasionally using 17-inch setups like 235/45R17 and 255/45R17. Always verify the exact size for your vehicle via the door placard or owner's manual.
