Tire size comparison
195/65R15 vs 205/65R15
Overall diameter, sidewall, revs per mile, and speedometer error — 205/65R15 is the taller tire, with a 2% speedo delta when swapping.
195/65R15
24.98in
635 mm overall diameter
205/65R15
25.49in
648 mm overall diameter
Diameter Δ
0.51 in
Speedo error
2%
195/65R15 revs/mi
807
205/65R15 revs/mi
791
Within the ±3% overall-diameter band usually considered safe for plus-sizing — speedometer and ABS calibration should stay close to factory.
Full spec
Side by side
| Metric | 195/65R15 | 205/65R15 |
|---|---|---|
| Section width | 195 mm | 205 mm |
| Aspect ratio | 65 | 65 |
| Wheel diameter | 15″ | 15″ |
| Sidewall height | 127 mm | 133 mm |
| Overall diameter | 24.98 in (635 mm) | 25.49 in (648 mm) |
| Circumference | 78.48 in | 80.09 in |
| Revolutions / mile | 807 | 791 |
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FAQ
Frequently asked
- What is the diameter difference between 195/65R15 and 205/65R15?
- 195/65R15 has an overall diameter of 24.98 inches (635 mm). 205/65R15 is 25.49 inches (648 mm). That's a 0.51 inch (13 mm) difference — 205/65R15 is taller.
- Will 205/65R15 cause speedometer error on a car fitted with 195/65R15?
- Swapping 195/65R15 for 205/65R15 produces a speedometer error of about 2%. Your speedometer will read lower than your actual speed — a 60 mph indicated reading is really 61.2 mph. Anything under 3% is usually acceptable without recalibration.
- How many revolutions per mile does each size do?
- 195/65R15 turns 807 revs per mile. 205/65R15 turns 791 revs per mile. Taller tyres turn fewer times per mile, which lowers effective final-drive ratio.
- What's the sidewall height difference?
- 195/65R15 has a sidewall of 127 mm (4.99 in). 205/65R15 sidewall is 133 mm (5.25 in). Lower-profile sidewalls give sharper steering response but less bump compliance.
- Is 205/65R15 a safe plus-size upgrade from 195/65R15?
- A plus-size upgrade is considered safe when overall diameter stays within ±3% — here the difference is 2%. This swap is within the typical safe range; speedometer and ABS calibration should remain close to factory.
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