195/65R15 vs 205/65R15 tire size
A 205/65R15 is 0.51 inches (13 mm) taller and 0.39 inches (10 mm) wider than a 195/65R15. Fit them in place of 195/65R15 tires and the speedometer reads low: at 60 mph on it you’re doing 61.2 mph, 2.0% faster, and the vehicle sits 0.26 inches (7 mm) higher.
Sources checked
| 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 (1,993 mm) | 80.1 in (2,034 mm) | +1.6 in |
| Revolutions per mile | 807 | 791 | −16 |
| Revolutions per km | 502 | 492 | −10 |
Check another speed or 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.
Speedometer
A 205/65R15 turns 791 times a mile against the 195/65R15’s 807. With a speedometer set for 195/65R15, true speed is what it shows × 25.49 ÷ 24.98:
| Speedometer shows | True speed | Difference |
|---|---|---|
| 25 mph | 25.5 mph | +0.5 mph |
| 35 mph | 35.7 mph | +0.7 mph |
| 45 mph | 45.9 mph | +0.9 mph |
| 55 mph | 56.1 mph | +1.1 mph |
| 65 mph | 66.3 mph | +1.3 mph |
| 75 mph | 76.5 mph | +1.5 mph |
Clearance
- Ground clearance: +0.26 in (+7 mm), half the change in diameter.
- Top of the tread: +0.26 in (+7 mm), so that much less room under the fender.
- Each side, on the same wheel: +0.20 in (+5 mm), toward the suspension inside and toward the fender lip outside.
A new wheel with a different width or offset moves the tire again. The sidewall goes from 4.99 to 5.25 inches.
What tire makers publish
Inflated on the maker’s measuring rim; the percentage is against the arithmetic.
| Tire | Size as printed | Diameter | Width | Revs per mile |
|---|---|---|---|---|
| Toyo Extensa A/S II | 195/65R15 | 25 in (+0.1%) | 7.9 in | 831 |
| Toyo Extensa A/S II | 205/65R15 | 25.5 in (0.0%) | 8.2 in | 816 |
Each size on its own
- 195/65R15 tire size: 25.0 × 7.7 in
- 205/65R15 tire size: 25.5 × 8.1 in
Questions
Can I fit 205/65R15 tires instead of 195/65R15?
They fit the same 15-inch wheels. A 205/65R15 is 0.51 inches (13 mm) taller and 0.39 inches (10 mm) wider than a 195/65R15, so check three things first: that your wheels are within the 205/65R15’s approved rim width range, which tire makers list for each size; that it clears the fenders and suspension at full lock and full travel; and that its load index meets what your door-jamb placard asks for.
How far off is the speedometer with 205/65R15 tires?
With a speedometer set for 195/65R15, the speedometer reads low: at 60 mph on it you’re doing 61.2 mph, 2.0% faster. The odometer is off the same way: over 1,000 miles driven it shows 979.9.
Does 205/65R15 change the ground clearance?
By +0.26 inches (+7 mm), half the change in diameter, at the axles and at the lowest point under them. On the same wheel, each sidewall sits 0.20 inches further out, inside and outside.
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.