185/65R15 vs 195/65R15 at a glance
| Measure | 185/65R15 (current) | 195/65R15 (new) | Difference |
|---|---|---|---|
| Overall height | 24.47 in | 24.98 in | +0.51 in (+2.09%) |
| Width | 7.28 in (185 mm) | 7.68 in (195 mm) | +10 mm |
| Sidewall | 4.73 in | 4.99 in | +0.26 in |
| Wheel | 15 in | 15 in | +0 in |
| Circumference | 76.9 in | 78.5 in | +1.6 in |
| Revs per mile | 824.2 | 807.4 | −16.9 |
Verdict: close match
Within the 3% rule of thumb, so the speedometer, gearing and ride height change little. Going from 185/65R15 to 195/65R15 is a 2.1% increase in overall height (+0.51 in), and the vehicle sits about 0.26 in higher. The tire is 10 mm wider. The 3% rule of thumb comes from Discount Tire and 1010tires; it is not a guarantee of fit.
True speed and odometer
| Speedometer shows | You are really doing | Difference |
|---|---|---|
| 35 mph | 35.7 mph | +0.7 mph |
| 45 mph | 45.9 mph | +0.9 mph |
| 55 mph | 56.2 mph | +1.2 mph |
| 60 mph | 61.3 mph | +1.3 mph |
| 65 mph | 66.4 mph | +1.4 mph |
| 70 mph | 71.5 mph | +1.5 mph |
| 75 mph | 76.6 mph | +1.6 mph |
Odometer: 1,000 indicated miles is 1,021 real miles, and 10,000 is 10,209.
The math
185/65R15: 15 + 2 × (185 × 65% ÷ 25.4) = 24.47 in. 195/65R15: 15 + 2 × (195 × 65% ÷ 25.4) = 24.98 in. Change = 24.98 ÷ 24.47 − 1 = +2.09%. True speed at 60 = 60 × 24.98 ÷ 24.47 = 61.26 mph.
Check next
- Regear and RPM at cruise for this swap
- Speedometer and odometer correction
- Other sizes within ±3% of 185/65R15
Calculated from the size alone. Real tires vary a little by brand and model, and the loaded radius is a bit smaller. Confirm the wheel width range, clearance, load index and speed rating for your vehicle. See how to read a tire size, the load index chart and the speed rating chart.
Size pages: 185/65R15 · 195/65R15. More swaps: all tire size comparisons.