Tire Size Chart
The Tire Size Chart is a sizing reference tool covering tire size chart, tire size conversion chart, tire size meaning, tire size comparison chart. Use the chart below to look up values instantly. Printable and downloadable versions are available on this page.
Tire Size Calculator
Enter your current tire size and an alternate size to compare diameters, check speedometer error, and verify rim fitment.
How to Read a Tire Size
Tire Size Reference Chart — Common Sizes
| Tire Size Code | Section Width (mm) | Sidewall Height (mm) | Rim Diameter (in) | Overall Diameter (in) | Revolutions Per Mile |
|---|---|---|---|---|---|
| 195/65R15 | 195 | 127 | 15 | 24.2 | 851 |
| 205/55R16 | 205 | 113 | 16 | 24.9 | 826 |
| 215/55R17 | 215 | 118 | 17 | 26.3 | 784 |
| 215/60R16 | 215 | 129 | 16 | 25.6 | 804 |
| 225/45R17 | 225 | 101 | 17 | 25.0 | 823 |
| 225/50R17 | 225 | 113 | 17 | 25.9 | 797 |
| 225/60R16 | 225 | 135 | 16 | 26.6 | 775 |
| 225/60R17 | 225 | 135 | 17 | 27.6 | 747 |
| 225/65R17 | 225 | 146 | 17 | 28.5 | 723 |
| 235/55R17 | 235 | 129 | 17 | 27.2 | 757 |
| 235/60R17 | 235 | 141 | 17 | 28.2 | 731 |
| 235/65R17 | 235 | 153 | 17 | 29.0 | 711 |
| 245/45R18 | 245 | 110 | 18 | 26.7 | 772 |
| 255/50R19 | 255 | 128 | 19 | 29.1 | 709 |
| 255/60R18 | 255 | 153 | 18 | 30.1 | 685 |
| 265/65R17 | 265 | 172 | 17 | 30.6 | 674 |
| 265/70R17 | 265 | 186 | 17 | 31.6 | 652 |
| 275/55R20 | 275 | 151 | 20 | 31.9 | 645 |
| 285/75R16 | 285 | 214 | 16 | 32.8 | 628 |
| 305/50R20 | 305 | 153 | 20 | 32.1 | 643 |
Source: Tire and Rim Association standard size calculation
Tire Speed Rating Chart
| Speed Rating Symbol | Maximum Speed (mph) | Maximum Speed (km/h) |
|---|---|---|
| L | 75 mph | 120 km/h |
| M | 81 mph | 130 km/h |
| Q | 99 mph | 160 km/h |
| R | 106 mph | 170 km/h |
| S | 112 mph | 180 km/h |
| T | 118 mph | 190 km/h |
| H | 130 mph | 210 km/h |
| V | 149 mph | 240 km/h |
| W | 168 mph | 270 km/h |
| Y | 186 mph | 300 km/h |
| Z | 149+ mph | 240+ km/h — see manufacturer for exact limit |
| ZR | 150+ mph | 240+ km/h — used on ultra-high-performance tires |
Source: Tire and Rim Association (TRA) speed rating standards
Tire Load Index Chart
| Load Index | Maximum Load (lbs) | Maximum Load (kg) |
|---|---|---|
| 75 | 853 lbs | 387 kg |
| 80 | 992 lbs | 450 kg |
| 85 | 1,135 lbs | 515 kg |
| 90 | 1,323 lbs | 600 kg |
| 95 | 1,521 lbs | 690 kg |
| 100 | 1,764 lbs | 800 kg |
| 105 | 2,039 lbs | 925 kg |
| 110 | 2,337 lbs | 1,060 kg |
| 115 | 2,679 lbs | 1,215 kg |
| 120 | 3,086 lbs | 1,400 kg |
Source: Tire and Rim Association load index standards
Tire Size Calculator
Enter your current tire size and compare to an alternate size to get the diameter difference, speedometer error percentage, and RPM change. The rim fitment checker confirms whether the alternate tire fits your existing wheels.
Frequently Asked Questions
What does P225/65R17 mean?
P means Passenger tire. 225 is the section width in mm, 65 is the aspect ratio (sidewall height as a percentage of width), R means Radial construction, and 17 is the rim diameter in inches.
How do I find the correct tire size for my car?
Your vehicle's recommended tire size is on a sticker inside the driver's door jamb — it shows the OEM size, recommended inflation pressure, and load index. It is also listed in your owner's manual.
Can I put a different size tire on my car?
You can fit different sized tires but the overall diameter should remain within 3 percent of the original to avoid affecting speedometer accuracy, fuel economy, and vehicle dynamics. Use a tire size calculator to compare overall diameters before purchasing.
What is plus sizing in tires?
Plus sizing means fitting a larger rim diameter with a lower-profile tire so the overall diameter stays approximately the same. This improves handling precision and appearance while maintaining correct speedometer calibration.
What does the load index number mean?
The load index is a code that represents the maximum weight one tire can safely carry. A load index of 95 means the tire supports up to 1,521 lbs per tire — for four tires this equals a maximum vehicle load of 6,084 lbs.
How do I know when my tires need replacing?
The legal minimum tread depth in most US states is 2/32 inch — test this with a penny inserted into the tread groove and check if Lincoln's head is fully visible. Most safety experts recommend replacing at 4/32 inch which gives significantly better wet weather stopping distance.
What is the difference between P and LT tires?
P (Passenger) tires are designed for cars, crossovers, and light SUVs with normal loads. LT (Light Truck) tires are built with heavier construction for trucks, full-size SUVs, towing, and carrying heavy loads — they run at higher inflation pressures.
What does the speed rating H mean on a tire?
The H speed rating means the tire is certified for speeds up to 130 mph (210 km/h). H-rated tires are standard on many performance sedans and sports cars and offer a good balance of performance and longevity.
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