Tire Size Differences

The main difference between 215/50R17 and 215/55R17 tires is in their overall diameter and sidewall height. The 215/55R17 tire is approximately 0.85 inches (21.5 mm) larger in diameter than the 215/50R17 tire. This difference results in a 3.2% change in overall tire size.

Sidewall Height

The 215/55R17 tire has a taller sidewall compared to the 215/50R17. The sidewall height difference is about 0.42 inches (10.75 mm). This taller sidewall can provide better shock absorption and a slightly more comfortable ride, especially on rough roads.

Width and Traction

Both tire sizes have the same width of 215 mm (approximately 8.46 inches). This means there's no difference in the tire's contact patch or potential traction based on width alone.

Performance Implications

Ground Clearance

The larger 215/55R17 tire offers a slight increase in ground clearance, which can be beneficial for driving over rough terrain or small obstacles.

Speedometer Accuracy

Switching from 215/50R17 to 215/55R17 will affect your vehicle's speedometer readings. When your speedometer shows 60 mph, your actual speed will be about 61.99 mph with the larger tires. This 3.2% difference is important to consider for accurate speed readings and fuel economy calculations.

Handling and Comfort

The 215/50R17 tire, with its lower profile, generally provides better handling and responsiveness. However, the 215/55R17, with its taller sidewall, offers improved ride comfort and better absorption of road imperfections.

Fitment Considerations

Before switching tire sizes, consider the following:

  • Vehicle compatibility: Ensure your vehicle can accommodate the slightly larger 215/55R17 tire without rubbing issues.
  • Wheel well clearance: Check if there's enough space in the wheel wells for the larger tire diameter.
  • Suspension components: Verify that the larger tires won't interfere with suspension parts during full articulation.

Conclusion

While it's possible to use 215/50R17 instead of 215/55R17, it's important to weigh the pros and cons. The smaller tire offers better handling and more accurate speedometer readings, while the larger tire provides improved comfort and slightly higher ground clearance. Always consult your vehicle's manual and consider professional advice before making tire size changes.

FAQs About Tire Size Changes

    • Will changing from 215/55R17 to 215/50R17 affect my fuel economy?
      Yes, slightly. The smaller tire may improve fuel economy due to less rolling resistance and weight.
    • Do I need to recalibrate my speedometer when changing tire sizes?
      It's recommended, especially if the size difference is more than 3%, to ensure accurate speed and odometer readings.
    • Can I mix 215/50R17 and 215/55R17 tires on my vehicle?
      It's not recommended to mix tire sizes as it can affect vehicle handling, stability, and potentially damage drivetrain components.