What size Tyres for Lexus is300h?
The Lexus IS300h typically uses 225/45R17 tyres on 17-inch wheels as the standard fitment, with 18-inch wheels commonly offering 235/45R18 tyres in many markets. Exact sizes can vary by model year and region, so always verify on your car’s placard or sidewall.
OEM tyre sizes by wheel diameter
Most IS300h models ship with 17-inch wheels and 225/45R17 tyres. Some higher-spec or market-specific variants equip 18-inch wheels with larger tyres. The precise size is listed on the tyre sidewall and on the door jamb placard.
- 17-inch wheels: 225/45R17
- 18-inch wheels: typically 235/45R18; in some markets or trims, 235/40R18 may also be used
As with any vehicle, sizes can vary by model year and region. Always confirm your exact size before buying tyres by checking the placard on the driver's door pillar or the owner's manual.
How to check the size on your car
Use a quick verification method to confirm the exact tyre size currently fitted to your IS300h.
- Open the driver's door and look at the tyre information placard on the door frame; note the "Tire Size" entry for the front and rear tyres.
- Inspect the sidewall of one of your tyres; the size is printed as something like 225/45R17.
- Cross-check against your owner's manual or Lexus's official spec sheet for your model year.
- If you're unsure or buying replacements, consult a Lexus dealer or a qualified tyre retailer with your VIN to confirm the correct size.
Following these steps ensures you purchase tyres that match the OEM specifications and maintain performance and safety.
What to consider when replacing tyres
When replacing tyres, you should consider compatibility and performance factors beyond merely matching numbers. The following guidelines help you choose appropriately.
- Keep overall rolling diameter within +/- 3% of the original to avoid speedometer errors and ABS issues.
- Match load index and speed rating to your vehicle's specifications and driving conditions.
- Choose an appropriate tyre type for your climate (all-season, summer, or winter) and driving style.
- Consider OEM-recommended brands or categories to preserve ride quality and handling.
If you're changing wheel sizes (for example, going from 17" to 18"), you may also need to recalibrate the speedometer or adjust suspension for braking performance and ride comfort.
Run-flat and alternative tire types
Some IS300h models can be fitted with run-flat tyres or with standard replacements. Run-flat tyres affect ride comfort and repair options, and may influence warranty considerations. Always verify compatibility with your wheels and vehicle systems.
Summary
In most markets, the Lexus IS300h uses 225/45R17 tyres on 17-inch wheels as standard, with 18-inch wheels commonly paired with 235/45R18 tyres (and in some trims 235/40R18). Because sizes can vary by year and region, always confirm the exact specification on the door placard or sidewall, and follow OEM guidance when replacing tyres to maintain safety and performance.
