Plus Sizing Tires Explained

If you're interested in enhancing your vehicle’s appearance or improving its performance, you’ve likely heard the term “plus sizing tires.” But what exactly does it mean? This guide will explain plus sizing tires, how it works, its benefits, and what to consider before making the switch.

What Is Plus Sizing?

Plus sizing refers to the practice of increasing your vehicle’s wheel diameter while decreasing the sidewall height of the tire, so the overall diameter of the tire stays the same (or close to it). This allows for a larger wheel and a lower-profile tire, which can give your car a sportier look and more responsive handling.

For example, if your original equipment tires are 215/60R16, a plus one upgrade might be 225/50R17 — one inch larger in wheel diameter but maintaining similar overall tire diameter.

Why Do People Plus Size Their Tires?

There are several reasons drivers consider plus sizing:

  • Improved Aesthetics: Larger wheels often look more aggressive and modern.
  • Enhanced Handling: Shorter sidewalls provide better cornering and road feel.
  • Better Braking: A wider tire footprint can lead to shorter stopping distances.
  • Customization: Enthusiasts love the flexibility plus sizing gives when selecting wheels and tires.

Types of Plus Sizing

There are a few common types of plus sizing, usually described by how many inches larger the wheel is compared to stock:

  • Plus Zero: You keep the same wheel size but choose a wider tire with a lower aspect ratio.
  • Plus One: Increase the wheel diameter by 1 inch and decrease sidewall height accordingly.
  • Plus Two: Increase by 2 inches, requiring a more dramatic drop in sidewall height.
  • Plus Three or More: For performance vehicles or custom builds; accuracy becomes critical.

Understanding the Tire Calculator

To accurately plus size your tires, you need to compare your original and desired sizes using a tire size calculator. It tells you if the change in diameter, speedometer impact, and clearance are within safe limits.

Example:

Let’s say your original size is 205/55R16. A plus one size might be 215/45R17. This keeps the overall diameter within 2% of stock, ensuring your speedometer and ABS remain accurate.

Pros of Plus Sizing Tires

  • Sporty Look: Bigger wheels and smaller sidewalls create a sleek, aggressive style.
  • Better Handling: Shorter sidewalls reduce tire flex in corners, giving sharper steering response.
  • Increased Road Feedback: Enthusiasts enjoy the more direct connection to the road surface.

Cons of Plus Sizing Tires

  • Harsher Ride: Thinner sidewalls mean less cushioning from potholes and road imperfections.
  • Higher Cost: Larger wheels and low-profile tires are generally more expensive.
  • Increased Risk of Damage: Low-profile tires are more prone to sidewall damage.
  • Impact on Fuel Economy: Heavier wheels may slightly reduce miles per gallon.

Important Considerations Before You Plus Size

  • Stay Within 3% Overall Diameter Difference: This keeps your speedometer and vehicle systems accurate.
  • Ensure Wheel and Tire Fitment: Avoid rubbing on suspension components or fenders.
  • Don’t Forget Load and Speed Ratings: Maintain or exceed your vehicle’s original specs.
  • Use a Professional Installer: Alignment and balancing are key to success with plus sizing.

How to Plus Size Correctly

  1. Start with your current tire size (from your sidewall or door jamb).
  2. Use a trusted tire size comparison calculator to test possible upgrades.
  3. Compare diameters, width, RPMs, and speedometer error.
  4. Verify rim width and offset for the new tire size.
  5. Double-check with a tire expert or professional shop before buying.

Can You Plus Size on All Vehicles?

Most vehicles can accommodate some level of plus sizing, but limitations exist. Compact cars may have less wheel well space than SUVs or trucks. Also, AWD systems are more sensitive to diameter changes, so always check manufacturer guidelines.

Conclusion

Plus sizing tires is a popular and effective way to enhance your vehicle’s style and performance. By understanding how plus sizing works, its benefits and drawbacks, and using a reliable calculator, you can make a safe, smart decision. Before you upgrade, visit tiresizeconversioncalculator.com to explore sizes and ensure a perfect match for your ride.

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