Owners of the 2018 Mazda CX-5 often discover that maintaining the vehicle’s performance starts with the rubber wrapped around the wheels. Selecting the correct tire size is not merely a matter of aesthetics; it directly impacts handling, fuel efficiency, and safety. For this specific model year, the factory specifications provide a clear foundation for making informed decisions about replacement tires.
Understanding the Standard 2018 CX-5 Dimensions
The 2018 model year offered a specific tire size as the default for the majority of trims, ensuring a balance of comfort and sportiness. This specification was engineered to work with the SKYACTIV-Vehicle Dynamics chassis tuning. Deviating significantly from this size without recalibration can lead to inaccurate speedometer readings and potential clearance issues.
Primary OEM Size: P225/50R17
The most common original equipment tire size for the 2018 Mazda CX-5 is P225/50R17. This metric indicates a tire that is 225 millimeters wide, with a sidewall height that is 50% of the width, designed to fit a 17-inch diameter wheel. This size is typically found on models equipped with the standard wheels.
Optional Wheel and Tire Packages
For trims such as the Grand Touring and above, Mazda offered an upgrade to larger diameter wheels to enhance the visual stance and road feedback. Owners of these higher trims will need to verify their specific tire dimensions.
Alternative Sizes for Trims and Upgrades
Depending on the trim level and optional packages selected, the 2018 CX-5 might require different measurements. It is crucial to check the placard located on the driver’s door jamb for the exact rating for your specific vehicle identification number.
Performance and Handling Considerations
Tire size plays a critical role in the driving dynamics that Mazda prioritized for the CX-5. A taller sidewall, such as the 50-series, generally provides a smoother ride and better absorbs road imperfections, which is beneficial for daily commuting. Conversely, a shorter sidewall, like the 45-series found on the 18-inch wheels, offers a stiffer sidewall that improves cornering response and reduces body roll, appealing to drivers who prefer a more engaging experience.
Speedometer Calibration and OBD Compliance
When changing tire sizes, it is essential to understand how this affects the vehicle’s computer. The speedometer calculates speed based on the tire’s circumference. Installing larger tires will cause the speedometer to read slower than the actual speed, while smaller tires will make it read faster. Furthermore, modifying the rolling circumference by more than 3% can trigger warning lights and affect traction control or all-wheel-drive systems in later model years.
