When it comes to upgrading or replacing your vehicle’s wheels and tires, understanding rim size is essential. A mismatch in size can affect handling, fuel efficiency, safety, and overall vehicle performance. That's where a tire rim size chart becomes incredibly useful. In this guide, we’ll explain what rim sizes mean, how to read a tire rim size chart, and how to choose the right size for your car.
What Is a Tire Rim Size?
The rim size refers to the diameter of the wheel, measured in inches, where the tire is mounted. This measurement is crucial because tires are designed to fit specific rim diameters. For example, a tire marked 225/45R17 fits a 17-inch rim.
Key Measurements on a Rim Size Chart
A typical tire rim size chart includes the following details:
Rim Diameter (in inches): Common sizes include 14”, 15”, 16”, 17”, 18”, 19”, 20” and beyond.
Rim Width: The distance between the inside edges of the rim’s flanges, usually measured in inches (e.g., 6.5J, 7J, 8J).
Bolt Pattern (PCD): The number of bolts and the diameter of the circle they form (e.g., 5x114.3).
Offset (ET): How far the mounting surface is from the centerline of the rim, affecting how far the wheels stick in or out.
Center Bore: The hole in the middle of the rim that fits over the hub of the car.
Example of a Tire Rim Size Chart
| Rim Size | Rim Width Range | Tire Width Range | Common Tire Sizes |
|---|---|---|---|
| 14" | 5" – 6" | 165 – 195 mm | 175/70R14, 185/65R14 |
| 15" | 5.5" – 7" | 175 – 205 mm | 195/65R15, 205/60R15 |
| 16" | 6" – 8" | 195 – 225 mm | 205/55R16, 215/60R16 |
| 17" | 6.5" – 8.5" | 205 – 245 mm | 225/45R17, 235/50R17 |
| 18" | 7" – 9" | 225 – 265 mm | 235/40R18, 245/45R18 |
| 19" | 7.5" – 9.5" | 235 – 275 mm | 245/40R19, 255/35R19 |
| 20" | 8" – 10" | 245 – 295 mm | 255/35R20, 275/30R20 |
Note: Always consult your vehicle’s manufacturer guidelines before changing rim sizes.
Why Rim Size Matters
Performance: Wider rims can improve cornering and grip but may decrease fuel efficiency.
Comfort: Larger rims with low-profile tires may offer a sportier feel but can make the ride stiffer.
Aesthetics: Upsizing rims can enhance the look of your vehicle but might require suspension adjustments.
Safety: Incorrect sizes can lead to poor handling, rubbing on fenders, or even tire blowouts.
Tips for Choosing the Right Rim Size
Check your owner’s manual or door jamb sticker for factory specs.
Consider your driving needs—performance, comfort, or fuel efficiency.
Use an online rim size calculator to compare stock vs. aftermarket sizes.
Never exceed manufacturer-recommended dimensions without expert advice.
Final Thoughts
Tire rim size charts are invaluable tools when shopping for new wheels or tires. By understanding the dimensions and what they mean for your vehicle, you can make safer and smarter decisions. Whether you're upgrading for style or optimizing for performance, always balance aesthetics with safety and function.