195/65R15 tire size
A 195/65R15 tire is 25.0 inches (635 mm) tall and 7.7 inches (195 mm) wide, for a 15-inch wheel. Each sidewall is 5.0 inches (127 mm), 65% of the width, and the tire makes about 807 revolutions a mile.
Sources checked
| Dimension | 195/65R15 |
|---|---|
| Overall diameter | 24.98 in (635 mm) |
| Section width | 7.68 in (195 mm) |
| Sidewall height | 4.99 in (127 mm) |
| Aspect ratio | 65% |
| Rim diameter | 15 in |
| Circumference | 78.5 in (1,993 mm) |
| Revolutions per mile | 807 |
| Revolutions per km | 502 |
Compare 195/65R15 with another size
Metric, LT and flotation
At 60 mph on the speedometer you’re doing
61.2mph
+2.0% · the speedometer reads low
- 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)
195/65R15 and 205/65R15 side by side
| Dimension | 195/65R15 | 205/65R15 | Change |
|---|---|---|---|
| Overall diameter | 24.98 in (635 mm) | 25.49 in (648 mm) | +0.51 in (+13 mm) |
| Section width | 7.68 in (195 mm) | 8.07 in (205 mm) | +0.39 in (+10 mm) |
| Sidewall height | 4.99 in (127 mm) | 5.25 in (133 mm) | +0.26 in (+6 mm) |
| Aspect ratio | 65% | 65% | |
| Rim diameter | 15 in | 15 in | |
| Circumference | 78.5 in | 80.1 in | +1.6 in |
| Revolutions per mile | 807 | 791 | −16 |
| Revolutions per km | 502 | 492 | −10 |
The working
- 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.
- 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.
- Speedometer. True speed = what it shows × new diameter ÷ old = 60 × 25.49 ÷ 24.98 = 61.2 mph.
- Ground clearance. Half the change in diameter: (25.49 − 24.98) ÷ 2 = +0.26 in.
Where the 195/65R15 numbers come from
The section width is 195 mm (7.68 inches), and each sidewall is 65% of it: 126.8 mm, or 4.99 inches. Two sidewalls and the 15-inch rim make 24.98 inches (635 mm).
One turn covers π × 24.98 = 78.5 inches, so the tire turns 807 times a mile and 502 times a kilometer.
What tire makers publish for 195/65R15
Inflated on the maker’s measuring rim. The percentage is the printed diameter against the 24.98 inches worked out above.
| Tire | Size as printed | Diameter | Width | Revs per mile |
|---|---|---|---|---|
| Toyo Extensa A/S II | 195/65R15 | 25 in (+0.1%) | 7.9 in | 831 |
Other 15-inch sizes against 195/65R15
Each size’s height against 195/65R15, and what a speedometer set for 195/65R15 shows at 60 mph with that size on.
| Size | Diameter | Width | Height change | At 60 mph shown |
|---|---|---|---|---|
| 205/65R15 compared | 25.5 in | 8.1 in | +2.0% | 61.2 mph |
| 235/75R15 | 28.9 in | 9.3 in | +15.6% | 69.4 mph |
| 31x10.50R15 | 31.0 in | 10.5 in | +24.1% | 74.5 mph |
| 33x12.50R15 | 33.0 in | 12.5 in | +32.1% | 79.3 mph |
195/65R15 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 195/65R15 in inches?
About 25.0x7.7R15: 25.0 inches tall and 7.7 inches wide on a 15-inch wheel, with 5.0-inch sidewalls. Exactly, 15 + 2 × 195 mm × 0.65 ÷ 25.4 = 24.98 inches.
How many revolutions per mile does a 195/65R15 make?
807 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 LT195/65R15 the same size as P195/65R15?
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.