215/45R17 tire size
A 215/45R17 tire is 24.6 inches (625 mm) tall and 8.5 inches (215 mm) wide, for a 17-inch wheel. Each sidewall is 3.8 inches (97 mm), 45% of the width, and the tire makes about 819 revolutions a mile.
Sources checked
| Dimension | 215/45R17 |
|---|---|
| Overall diameter | 24.62 in (625 mm) |
| Section width | 8.46 in (215 mm) |
| Sidewall height | 3.81 in (97 mm) |
| Aspect ratio | 45% |
| Rim diameter | 17 in |
| Circumference | 77.3 in (1,964 mm) |
| Revolutions per mile | 819 |
| Revolutions per km | 509 |
Compare 215/45R17 with another size
Metric, LT and flotation
At 60 mph on the speedometer you’re doing
62.1mph
+3.4% · the speedometer reads low
- Height
- +0.85 in (+21 mm)
- Width
- 0.00 in (0 mm)
- Ground clearance
- +0.42 in (+11 mm)
- Each side, same wheel
- 0.00 in (0 mm)
215/45R17 and 215/50R17 side by side
| Dimension | 215/45R17 | 215/50R17 | Change |
|---|---|---|---|
| Overall diameter | 24.62 in (625 mm) | 25.46 in (647 mm) | +0.84 in (+22 mm) |
| Section width | 8.46 in (215 mm) | 8.46 in (215 mm) | 0.00 in (0 mm) |
| Sidewall height | 3.81 in (97 mm) | 4.23 in (108 mm) | +0.42 in (+11 mm) |
| Aspect ratio | 45% | 50% | |
| Rim diameter | 17 in | 17 in | |
| Circumference | 77.3 in | 80.0 in | +2.7 in |
| Revolutions per mile | 819 | 792 | −27 |
| Revolutions per km | 509 | 492 | −17 |
The working
- 215/45R17: sidewall = 215 mm × 45% = 96.8 mm = 3.81 in.
- Diameter = rim + 2 × sidewall = 17 + 2 × 3.81 = 24.62 in (625 mm).
- Circumference = π × 24.62 = 77.3 in; revolutions per mile = 63,360 ÷ 77.3 = 819.
- 215/50R17: sidewall = 215 mm × 50% = 107.5 mm = 4.23 in.
- Diameter = rim + 2 × sidewall = 17 + 2 × 4.23 = 25.46 in (647 mm).
- Circumference = π × 25.46 = 80.0 in; revolutions per mile = 63,360 ÷ 80.0 = 792.
- Speedometer. True speed = what it shows × new diameter ÷ old = 60 × 25.46 ÷ 24.62 = 62.1 mph.
- Ground clearance. Half the change in diameter: (25.46 − 24.62) ÷ 2 = +0.42 in.
Where the 215/45R17 numbers come from
The section width is 215 mm (8.46 inches), and each sidewall is 45% of it: 96.8 mm, or 3.81 inches. Two sidewalls and the 17-inch rim make 24.62 inches (625 mm).
One turn covers π × 24.62 = 77.3 inches, so the tire turns 819 times a mile and 509 times a kilometer.
What tire makers publish for 215/45R17
Inflated on the maker’s measuring rim. The percentage is the printed diameter against the 24.62 inches worked out above.
| Tire | Size as printed | Diameter | Width | Revs per mile |
|---|---|---|---|---|
| Toyo Proxes Sport A/S | 215/45R17 | 24.6 in (−0.1%) | 8.4 in | 843 |
Other 17-inch sizes against 215/45R17
Each size’s height against 215/45R17, and what a speedometer set for 215/45R17 shows at 60 mph with that size on.
| Size | Diameter | Width | Height change | At 60 mph shown |
|---|---|---|---|---|
| 215/50R17 compared | 25.5 in | 8.5 in | +3.4% | 62.1 mph |
| 215/55R17 | 26.3 in | 8.5 in | +6.9% | 64.1 mph |
| 215/60R17 | 27.2 in | 8.5 in | +10.3% | 66.2 mph |
| 225/45R17 compared | 25.0 in | 8.9 in | +1.4% | 60.9 mph |
| 225/50R17 | 25.9 in | 8.9 in | +5.0% | 63.0 mph |
| 225/55R17 | 26.7 in | 8.9 in | +8.6% | 65.2 mph |
| 225/60R17 | 27.6 in | 8.9 in | +12.2% | 67.3 mph |
| 225/65R17 | 28.5 in | 8.9 in | +15.8% | 69.5 mph |
| 235/55R17 | 27.2 in | 9.3 in | +10.4% | 66.2 mph |
| 235/60R17 | 28.1 in | 9.3 in | +14.2% | 68.5 mph |
| 235/65R17 | 29.0 in | 9.3 in | +17.9% | 70.7 mph |
| 245/65R17 | 29.5 in | 9.6 in | +20.0% | 72.0 mph |
| 245/70R17 | 30.5 in | 9.6 in | +23.9% | 74.3 mph |
| 245/75R17 | 31.5 in | 9.6 in | +27.8% | 76.7 mph |
| 255/70R17 | 31.1 in | 10.0 in | +26.1% | 75.7 mph |
| 265/65R17 | 30.6 in | 10.4 in | +24.1% | 74.5 mph |
| 265/70R17 | 31.6 in | 10.4 in | +28.4% | 77.0 mph |
| 275/70R17 | 32.2 in | 10.8 in | +30.6% | 78.4 mph |
| 285/70R17 | 32.7 in | 11.2 in | +32.9% | 79.7 mph |
| 285/75R17 | 33.8 in | 11.2 in | +37.4% | 82.5 mph |
| 315/70R17 | 34.4 in | 12.4 in | +39.6% | 83.7 mph |
| 33x12.50R17 | 33.0 in | 12.5 in | +34.0% | 80.4 mph |
| 35x12.50R17 | 35.0 in | 12.5 in | +42.2% | 85.3 mph |
| 37x12.50R17 | 37.0 in | 12.5 in | +50.3% | 90.2 mph |
215/45R17 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 215/45R17 in inches?
About 24.6x8.5R17: 24.6 inches tall and 8.5 inches wide on a 17-inch wheel, with 3.8-inch sidewalls. Exactly, 17 + 2 × 215 mm × 0.45 ÷ 25.4 = 24.62 inches.
How many revolutions per mile does a 215/45R17 make?
819 by its diameter: 63,360 inches in a mile ÷ 77.3 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 LT215/45R17 the same size as P215/45R17?
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.