225/45R17 tire size
A 225/45R17 tire is 25.0 inches (634 mm) tall and 8.9 inches (225 mm) wide, for a 17-inch wheel. Each sidewall is 4.0 inches (101 mm), 45% of the width, and the tire makes about 808 revolutions a mile.
Sources checked
| Dimension | 225/45R17 |
|---|---|
| Overall diameter | 24.97 in (634 mm) |
| Section width | 8.86 in (225 mm) |
| Sidewall height | 3.99 in (101 mm) |
| Aspect ratio | 45% |
| Rim diameter | 17 in |
| Circumference | 78.5 in (1,993 mm) |
| Revolutions per mile | 808 |
| Revolutions per km | 502 |
Compare 225/45R17 with another size
Metric, LT and flotation
At 60 mph on the speedometer you’re doing
62.1mph
+3.5% · the speedometer reads low
- Height
- +0.89 in (+23 mm)
- Width
- 0.00 in (0 mm)
- Ground clearance
- +0.44 in (+11 mm)
- Each side, same wheel
- 0.00 in (0 mm)
225/45R17 and 225/50R17 side by side
| Dimension | 225/45R17 | 225/50R17 | Change |
|---|---|---|---|
| Overall diameter | 24.97 in (634 mm) | 25.86 in (657 mm) | +0.89 in (+23 mm) |
| Section width | 8.86 in (225 mm) | 8.86 in (225 mm) | 0.00 in (0 mm) |
| Sidewall height | 3.99 in (101 mm) | 4.43 in (113 mm) | +0.44 in (+12 mm) |
| Aspect ratio | 45% | 50% | |
| Rim diameter | 17 in | 17 in | |
| Circumference | 78.5 in | 81.2 in | +2.7 in |
| Revolutions per mile | 808 | 780 | −28 |
| Revolutions per km | 502 | 485 | −17 |
The working
- 225/45R17: sidewall = 225 mm × 45% = 101.3 mm = 3.99 in.
- Diameter = rim + 2 × sidewall = 17 + 2 × 3.99 = 24.97 in (634 mm).
- Circumference = π × 24.97 = 78.5 in; revolutions per mile = 63,360 ÷ 78.5 = 808.
- 225/50R17: sidewall = 225 mm × 50% = 112.5 mm = 4.43 in.
- Diameter = rim + 2 × sidewall = 17 + 2 × 4.43 = 25.86 in (657 mm).
- Circumference = π × 25.86 = 81.2 in; revolutions per mile = 63,360 ÷ 81.2 = 780.
- Speedometer. True speed = what it shows × new diameter ÷ old = 60 × 25.86 ÷ 24.97 = 62.1 mph.
- Ground clearance. Half the change in diameter: (25.86 − 24.97) ÷ 2 = +0.44 in.
Where the 225/45R17 numbers come from
The section width is 225 mm (8.86 inches), and each sidewall is 45% of it: 101.3 mm, or 3.99 inches. Two sidewalls and the 17-inch rim make 24.97 inches (634 mm).
One turn covers π × 24.97 = 78.5 inches, so the tire turns 808 times a mile and 502 times a kilometer.
What tire makers publish for 225/45R17
Inflated on the maker’s measuring rim. The percentage is the printed diameter against the 24.97 inches worked out above.
| Tire | Size as printed | Diameter | Width | Revs per mile |
|---|---|---|---|---|
| Toyo Extensa A/S II | 225/45R17 | 25 in (+0.1%) | 8.9 in | 832 |
| Toyo Proxes Sport A/S | 225/45R17 | 25 in (+0.1%) | 8.9 in | 832 |
Other 17-inch sizes against 225/45R17
Each size’s height against 225/45R17, and what a speedometer set for 225/45R17 shows at 60 mph with that size on.
| Size | Diameter | Width | Height change | At 60 mph shown |
|---|---|---|---|---|
| 215/45R17 compared | 24.6 in | 8.5 in | −1.4% | 59.1 mph |
| 215/50R17 | 25.5 in | 8.5 in | +2.0% | 61.2 mph |
| 215/55R17 | 26.3 in | 8.5 in | +5.4% | 63.2 mph |
| 215/60R17 | 27.2 in | 8.5 in | +8.7% | 65.2 mph |
| 225/50R17 compared | 25.9 in | 8.9 in | +3.5% | 62.1 mph |
| 225/55R17 | 26.7 in | 8.9 in | +7.1% | 64.3 mph |
| 225/60R17 | 27.6 in | 8.9 in | +10.6% | 66.4 mph |
| 225/65R17 | 28.5 in | 8.9 in | +14.2% | 68.5 mph |
| 235/55R17 | 27.2 in | 9.3 in | +8.8% | 65.3 mph |
| 235/60R17 | 28.1 in | 9.3 in | +12.5% | 67.5 mph |
| 235/65R17 | 29.0 in | 9.3 in | +16.2% | 69.7 mph |
| 245/65R17 | 29.5 in | 9.6 in | +18.3% | 71.0 mph |
| 245/70R17 | 30.5 in | 9.6 in | +22.2% | 73.3 mph |
| 245/75R17 | 31.5 in | 9.6 in | +26.0% | 75.6 mph |
| 255/70R17 | 31.1 in | 10.0 in | +24.4% | 74.6 mph |
| 265/65R17 | 30.6 in | 10.4 in | +22.4% | 73.4 mph |
| 265/70R17 | 31.6 in | 10.4 in | +26.6% | 75.9 mph |
| 275/70R17 | 32.2 in | 10.8 in | +28.8% | 77.3 mph |
| 285/70R17 | 32.7 in | 11.2 in | +31.0% | 78.6 mph |
| 285/75R17 | 33.8 in | 11.2 in | +35.5% | 81.3 mph |
| 315/70R17 | 34.4 in | 12.4 in | +37.6% | 82.6 mph |
| 33x12.50R17 | 33.0 in | 12.5 in | +32.1% | 79.3 mph |
| 35x12.50R17 | 35.0 in | 12.5 in | +40.2% | 84.1 mph |
| 37x12.50R17 | 37.0 in | 12.5 in | +48.2% | 88.9 mph |
225/45R17 compared
Every size: the tire size calculator. With the wheels off, the nuts go back on at your vehicle’s lug nut torque.
Questions
What is 225/45R17 in inches?
About 25.0x8.9R17: 25.0 inches tall and 8.9 inches wide on a 17-inch wheel, with 4.0-inch sidewalls. Exactly, 17 + 2 × 225 mm × 0.45 ÷ 25.4 = 24.97 inches.
How many revolutions per mile does a 225/45R17 make?
808 by its diameter: 63,360 inches in a mile ÷ 78.5 inches a turn. Tire makers’ published figures are measured under load, when the tire rolls on a slightly smaller radius, and run 2.8% to 3.3% higher in Toyo’s tables.
Is LT225/45R17 the same size as P225/45R17?
In dimensions, yes: the numbers mean the same in every metric size. The letters mark what the tire is built for, and an LT tire’s load is rated differently, so check the load index and pressure your vehicle needs before swapping one for the other.
Sources
- Bridgestone Americas: Determining tire size: P-metric, Euro-metric, LT-metric, C-type and flotation sizes, and what each number means (checked October 28, 2026)
- Toyo Tires: Extensa A/S II sizes and specifications: inflated overall diameter and width, revolutions per mile (checked October 28, 2026)
- Toyo Tires: Proxes Sport A/S sizes and specifications: inflated overall diameter and width, revolutions per mile (checked October 28, 2026)
- Toyo Tires: Open Country A/T III sizes and specifications: P-metric, LT-metric and flotation sizes, with revolutions per mile (checked October 28, 2026)
- Nitto Tire: Trail Grappler M/T sizes and specs: inflated overall diameter and width, LT-metric and flotation sizes (checked October 28, 2026)
Spotted a number that doesn’t match your manual or a source? Tell us; corrections are logged on the sources page.