Tire Size Comparison Chart: Dimensions for 80+ Common Sizes
Quick answer: A 265/70R17 measures 31.6" overall diameter and 10.4" wide. A 285/70R17 is 32.7" diameter and 11.2" wide — 1.1 inches taller and nearly an inch wider. The full chart below covers 80+ sizes with every dimension you need. Want a side-by-side for two specific sizes? Use the tire size calculator.
I built this chart because I got tired of opening six browser tabs every time I wanted to compare tire sizes for my truck. Every tire shop website makes you enter sizes one at a time, click through three pages of ads, and then gives you the numbers in a format that's hard to compare. This is the reference table I wish existed when I was shopping.
All dimensions are calculated from the standard tire size formula. Real-world measurements vary by 1-3% depending on manufacturer, tread depth, and inflation pressure — but these numbers are accurate enough for fitment decisions, speedometer correction, and clearance checks.
Passenger Car Tire Sizes
These are the most common sizes found on sedans, hatchbacks, and compact crossovers. Sorted by overall diameter.
| Tire Size | Diameter (in) | Width (in) | Sidewall (in) | Circumference (in) | Revs/Mile |
|---|---|---|---|---|---|
| 185/65R15 | 24.5 | 7.3 | 4.7 | 76.9 | 824 |
| 195/65R15 | 25.0 | 7.7 | 5.0 | 78.5 | 808 |
| 205/55R16 | 24.9 | 8.1 | 4.4 | 78.1 | 812 |
| 205/60R16 | 25.7 | 8.1 | 4.8 | 80.6 | 786 |
| 215/55R16 | 25.3 | 8.5 | 4.7 | 79.4 | 799 |
| 215/55R17 | 26.3 | 8.5 | 4.7 | 82.5 | 769 |
| 215/60R16 | 26.2 | 8.5 | 5.1 | 82.1 | 773 |
| 225/45R17 | 25.0 | 8.9 | 4.0 | 78.5 | 808 |
| 225/50R17 | 25.9 | 8.9 | 4.4 | 81.2 | 781 |
| 225/55R17 | 26.7 | 8.9 | 4.9 | 83.9 | 756 |
| 225/60R17 | 27.6 | 8.9 | 5.3 | 86.7 | 731 |
| 225/65R17 | 28.5 | 8.9 | 5.8 | 89.5 | 709 |
| 235/45R18 | 26.3 | 9.3 | 4.2 | 82.7 | 767 |
| 235/55R18 | 28.2 | 9.3 | 5.1 | 88.4 | 717 |
| 235/60R18 | 29.1 | 9.3 | 5.6 | 91.4 | 694 |
| 245/45R18 | 26.7 | 9.6 | 4.3 | 83.7 | 758 |
| 245/40R19 | 26.7 | 9.6 | 3.9 | 83.8 | 757 |
| 245/45R19 | 27.7 | 9.6 | 4.3 | 86.8 | 731 |
| 245/50R20 | 29.7 | 9.6 | 4.8 | 93.2 | 680 |
Truck and SUV Tire Sizes (Metric)
Where it gets interesting. Truck tires have more variation because people upsize for off-road clearance, towing capability, or aesthetics. Sorted by overall diameter.
| Tire Size | Diameter (in) | Width (in) | Sidewall (in) | Circumference (in) | Revs/Mile |
|---|---|---|---|---|---|
| 235/70R16 | 29.0 | 9.3 | 6.5 | 91.0 | 697 |
| 245/70R16 | 29.5 | 9.6 | 6.8 | 92.6 | 685 |
| 245/75R16 | 30.5 | 9.6 | 7.2 | 95.7 | 662 |
| 255/70R17 | 31.1 | 10.0 | 7.0 | 97.5 | 651 |
| 265/65R17 | 30.6 | 10.4 | 6.8 | 96.0 | 661 |
| 265/70R17 | 31.6 | 10.4 | 7.3 | 99.3 | 639 |
| 265/65R18 | 31.6 | 10.4 | 6.8 | 99.2 | 639 |
| 265/70R18 | 32.6 | 10.4 | 7.3 | 102.4 | 619 |
| 275/65R18 | 32.1 | 10.8 | 7.0 | 100.7 | 630 |
| 275/70R17 | 32.2 | 10.8 | 7.6 | 101.0 | 628 |
| 275/70R18 | 33.2 | 10.8 | 7.6 | 104.1 | 609 |
| 275/55R20 | 31.9 | 10.8 | 6.0 | 100.2 | 633 |
| 275/60R20 | 33.0 | 10.8 | 6.5 | 103.6 | 612 |
| 285/65R18 | 32.6 | 11.2 | 7.3 | 102.3 | 620 |
| 285/70R17 | 32.7 | 11.2 | 7.9 | 102.8 | 617 |
| 285/75R16 | 32.8 | 11.2 | 8.4 | 103.1 | 615 |
| 285/75R17 | 33.8 | 11.2 | 8.4 | 106.2 | 597 |
| 295/70R17 | 33.3 | 11.6 | 8.1 | 104.5 | 607 |
| 305/65R17 | 32.6 | 12.0 | 7.8 | 102.4 | 619 |
| 315/70R17 | 34.4 | 12.4 | 8.7 | 108.1 | 587 |
| 325/65R18 | 34.1 | 12.8 | 8.3 | 107.0 | 593 |
Also notice how fast diameter climbs when you go up in width. Moving from 265/70R17 to 285/70R17 adds only 20 mm of width but 1.1" of diameter because the 70% aspect ratio is applied to a wider base. If you only want wider without taller, drop the aspect ratio — 285/65R17 gives you the width with only 0.3" diameter increase.
Flotation (Inch-Based) Tire Sizes
Off-road and oversized truck tires often use the flotation system: Diameter x Width R Rim. Here's how they translate to metric:
| Flotation Size | Diameter (in) | Width (in) | Approx Metric Equivalent |
|---|---|---|---|
| 31x10.5R15 | 31.0 | 10.5 | 265/75R15 |
| 32x11.5R15 | 32.0 | 11.5 | 290/75R15 |
| 33x10.5R15 | 33.0 | 10.5 | 265/75R16 (close) |
| 33x12.5R15 | 33.0 | 12.5 | 318/80R15 |
| 33x12.5R17 | 33.0 | 12.5 | 318/72R17 |
| 33x12.5R18 | 33.0 | 12.5 | 318/65R18 |
| 35x11.5R17 | 35.0 | 11.5 | 292/78R17 |
| 35x12.5R17 | 35.0 | 12.5 | 318/75R17 |
| 35x12.5R18 | 35.0 | 12.5 | 318/69R18 |
| 35x12.5R20 | 35.0 | 12.5 | 318/60R20 |
| 37x12.5R17 | 37.0 | 12.5 | 318/81R17 |
| 37x13.5R17 | 37.0 | 13.5 | 343/77R17 |
One thing that catches people: a "33-inch tire" in flotation isn't always 33 inches. Manufacturers measure at different inflation pressures and load conditions. A 33x12.5R17 from BFGoodrich might measure 32.8" while the same size from Nitto measures 33.2". Check the manufacturer's spec sheet for the actual measured diameter before assuming fitment.
Speedometer Impact by Size Change
This is the chart everyone actually needs when shopping for different tires. It shows how much your speedometer will be off when you swap from one size to another.
When your speedo reads 60 mph with these common swaps:
| From | To | Actual Speed | Speedo Error |
|---|---|---|---|
| 265/70R17 | 285/70R17 | 62.1 mph | +3.5% |
| 265/70R17 | 275/70R17 | 61.1 mph | +1.9% |
| 265/70R17 | 265/75R17 | 61.6 mph | +2.7% |
| 265/70R17 | 33x12.5R17 | 62.7 mph | +4.4% |
| 265/70R17 | 35x12.5R17 | 66.5 mph | +10.8% |
| 265/70R17 | 245/75R16 | 58.0 mph | -3.5% |
| 265/70R17 | 265/65R18 | 60.0 mph | +0.0% |
| 265/70R17 | 275/55R20 | 60.6 mph | +1.0% |
Jumping to 35-inch tires on a stock truck is a 10.8% change. That means your odometer under-reports by 10.8%, your speedometer reads low by 6-7 mph at highway speed, and your transmission shifts at the wrong road speeds. This is why 35s on stock trucks feel sluggish — the truck thinks you're going slower than you are and keeps the transmission in a lower gear longer.
How to Pick the Right Tire Size
Choosing a new tire size isn't just about what fits. Here's a decision framework based on what you actually care about:
For daily driving and commuting: Stay stock. The manufacturer spent millions optimizing that tire size for your vehicle's suspension geometry, gear ratios, and fuel economy. Going one step wider (e.g., 255 to 265) is fine for better wet traction, but check that your wheel width supports it.
For towing and hauling: Stay stock diameter, consider going wider and upgrading to LT-rated tires if your vehicle came with P-rated. The wider contact patch improves stability under load. Read the towing capacity guide before making changes — tire ratings directly affect your legal towing capacity.
For moderate off-road use: One step up in diameter (about 1 inch) usually clears trail obstacles without requiring a lift kit or fender trimming. For a stock 265/70R17 truck, 275/70R17 or 285/65R17 are safe bets that add clearance without causing issues.
For serious off-road builds: 33-inch or 35-inch tires require a 2-3 inch lift, possibly fender trimming, and a speedometer recalibration. Budget for the full build, not just the tires. A set of 35x12.5R17s costs $800-1,400, but the lift kit, new shocks, and alignment add another $1,500-3,000.
FAQ
What tire size is equivalent to 33 inches?
The closest metric equivalents to a 33-inch tire on a 17-inch wheel are 285/75R17 (33.8"), 285/70R17 (32.7"), and 305/65R17 (32.6"). None are exact — 33x12.5R17 in flotation sizing is its own spec. If you want true 33 inches, buy the flotation size. If you want a close metric alternative, 285/75R17 is the nearest at 33.8".
How much bigger is a 275 tire than a 265?
A 275 tire is 10 mm (0.39 inches) wider than a 265 tire. If both are the same aspect ratio and rim size — say 265/70R17 vs 275/70R17 — the 275 is also 0.55 inches taller in overall diameter because the sidewall height scales with the width. Total difference: about half an inch wider and half an inch taller.
Can I use a tire size chart to check fitment?
A chart gives you the dimensions, but fitment also depends on wheel width, backspacing/offset, fender clearance, and suspension geometry. The chart tells you whether the tire will physically mount on your wheel and whether the diameter is close to stock. For actual clearance, you also need to measure from the tire's outer edge to the fender at full steering lock and full suspension compression. Tire shops can measure this, or you can check vehicle-specific forums for documented fitment.
Why do some trucks use metric and others use flotation sizing?
Metric sizing (like 265/70R17) comes from the European standard and is used by most OEM manufacturers. Flotation sizing (like 33x12.5R17) originated in the US off-road market where knowing the exact diameter and width matters more than aspect ratio. Most highway-oriented tires use metric. Most mud-terrain and oversize all-terrain tires offer both designations. Same tire, different label.
What happens if I put the wrong size tires on my car?
If the diameter is significantly different from stock (more than 3%), your speedometer will be inaccurate, your ABS and traction control may not function correctly, and your transmission may shift at the wrong points. If the width is too wide for the wheel, the tire bead won't seat properly and could unseat at speed. If the tire is too tall, it will rub on the fender or suspension during turns or bumps. Minor size differences (1-2%) are generally harmless.
Next Steps
- Compare any two sizes head-to-head with the tire size calculator — it shows diameter, width, circumference, and speedometer correction instantly.
- Understand what every number on the sidewall means in our tire size explained guide.
- Changed tire sizes and need to know your true speed? Use the speedometer correction calculator.