205/65R15 tire size
A 205/65R15 tire is 25.5 inches (648 mm) tall and 8.1 inches (205 mm) wide, for a 15-inch wheel. Each sidewall is 5.2 inches (133 mm), 65% of the width, and the tire makes about 791 revolutions a mile.
Sources checked
| Dimension | 205/65R15 |
|---|---|
| Overall diameter | 25.49 in (648 mm) |
| Section width | 8.07 in (205 mm) |
| Sidewall height | 5.25 in (133 mm) |
| Aspect ratio | 65% |
| Rim diameter | 15 in |
| Circumference | 80.1 in (2,034 mm) |
| Revolutions per mile | 791 |
| Revolutions per km | 492 |
Compare 205/65R15 with another size
Metric, LT and flotation
At 60 mph on the speedometer you’re doing
58.8mph
−2.0% · the speedometer reads high
- Height
- −0.51 in (−13 mm)
- Width
- −0.39 in (−10 mm)
- Ground clearance
- −0.26 in (−7 mm)
- Each side, same wheel
- −0.20 in (−5 mm)
205/65R15 and 195/65R15 side by side
| Dimension | 205/65R15 | 195/65R15 | Change |
|---|---|---|---|
| Overall diameter | 25.49 in (648 mm) | 24.98 in (635 mm) | −0.51 in (−13 mm) |
| Section width | 8.07 in (205 mm) | 7.68 in (195 mm) | −0.39 in (−10 mm) |
| Sidewall height | 5.25 in (133 mm) | 4.99 in (127 mm) | −0.26 in (−6 mm) |
| Aspect ratio | 65% | 65% | |
| Rim diameter | 15 in | 15 in | |
| Circumference | 80.1 in | 78.5 in | −1.6 in |
| Revolutions per mile | 791 | 807 | +16 |
| Revolutions per km | 492 | 502 | +10 |
The working
- 205/65R15: sidewall = 205 mm × 65% = 133.3 mm = 5.25 in.
- Diameter = rim + 2 × sidewall = 15 + 2 × 5.25 = 25.49 in (648 mm).
- Circumference = π × 25.49 = 80.1 in; revolutions per mile = 63,360 ÷ 80.1 = 791.
- 195/65R15: sidewall = 195 mm × 65% = 126.8 mm = 4.99 in.
- Diameter = rim + 2 × sidewall = 15 + 2 × 4.99 = 24.98 in (635 mm).
- Circumference = π × 24.98 = 78.5 in; revolutions per mile = 63,360 ÷ 78.5 = 807.
- Speedometer. True speed = what it shows × new diameter ÷ old = 60 × 24.98 ÷ 25.49 = 58.8 mph.
- Ground clearance. Half the change in diameter: (24.98 − 25.49) ÷ 2 = −0.26 in.
Where the 205/65R15 numbers come from
The section width is 205 mm (8.07 inches), and each sidewall is 65% of it: 133.3 mm, or 5.25 inches. Two sidewalls and the 15-inch rim make 25.49 inches (648 mm).
One turn covers π × 25.49 = 80.1 inches, so the tire turns 791 times a mile and 492 times a kilometer.
What tire makers publish for 205/65R15
Inflated on the maker’s measuring rim. The percentage is the printed diameter against the 25.49 inches worked out above.
| Tire | Size as printed | Diameter | Width | Revs per mile |
|---|---|---|---|---|
| Toyo Extensa A/S II | 205/65R15 | 25.5 in (0.0%) | 8.2 in | 816 |
Other 15-inch sizes against 205/65R15
Each size’s height against 205/65R15, and what a speedometer set for 205/65R15 shows at 60 mph with that size on.
| Size | Diameter | Width | Height change | At 60 mph shown |
|---|---|---|---|---|
| 195/65R15 compared | 25.0 in | 7.7 in | −2.0% | 58.8 mph |
| 235/75R15 | 28.9 in | 9.3 in | +13.3% | 68.0 mph |
| 31x10.50R15 | 31.0 in | 10.5 in | +21.6% | 73.0 mph |
| 33x12.50R15 | 33.0 in | 12.5 in | +29.5% | 77.7 mph |
205/65R15 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 205/65R15 in inches?
About 25.5x8.1R15: 25.5 inches tall and 8.1 inches wide on a 15-inch wheel, with 5.2-inch sidewalls. Exactly, 15 + 2 × 205 mm × 0.65 ÷ 25.4 = 25.49 inches.
How many revolutions per mile does a 205/65R15 make?
791 by its diameter: 63,360 inches in a mile ÷ 80.1 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 LT205/65R15 the same size as P205/65R15?
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.