Tire size comparison
185/60R15 vs 195/60R15
Overall diameter, sidewall, revs per mile, and speedometer error — 195/60R15 is the taller tire, with a 2% speedo delta when swapping.
185/60R15
23.74in
603 mm overall diameter
195/60R15
24.21in
615 mm overall diameter
Diameter Δ
0.47 in
Speedo error
2%
185/60R15 revs/mi
850
195/60R15 revs/mi
833
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 | 185/60R15 | 195/60R15 |
|---|---|---|
| Section width | 185 mm | 195 mm |
| Aspect ratio | 60 | 60 |
| Wheel diameter | 15″ | 15″ |
| Sidewall height | 111 mm | 117 mm |
| Overall diameter | 23.74 in (603 mm) | 24.21 in (615 mm) |
| Circumference | 74.58 in | 76.07 in |
| Revolutions / mile | 850 | 833 |
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FAQ
Frequently asked
- What is the diameter difference between 185/60R15 and 195/60R15?
- 185/60R15 has an overall diameter of 23.74 inches (603 mm). 195/60R15 is 24.21 inches (615 mm). That's a 0.47 inch (12 mm) difference — 195/60R15 is taller.
- Will 195/60R15 cause speedometer error on a car fitted with 185/60R15?
- Swapping 185/60R15 for 195/60R15 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?
- 185/60R15 turns 850 revs per mile. 195/60R15 turns 833 revs per mile. Taller tyres turn fewer times per mile, which lowers effective final-drive ratio.
- What's the sidewall height difference?
- 185/60R15 has a sidewall of 111 mm (4.37 in). 195/60R15 sidewall is 117 mm (4.61 in). Lower-profile sidewalls give sharper steering response but less bump compliance.
- Is 195/60R15 a safe plus-size upgrade from 185/60R15?
- 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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