215/70R15 vs 225/70R15 at a glance
| Measure | 215/70R15 (current) | 225/70R15 (new) | Difference |
|---|---|---|---|
| Overall height | 26.85 in | 27.40 in | +0.55 in (+2.05%) |
| Width | 8.46 in (215 mm) | 8.86 in (225 mm) | +10 mm |
| Sidewall | 5.93 in | 6.20 in | +0.28 in |
| Wheel | 15 in | 15 in | +0 in |
| Circumference | 84.4 in | 86.1 in | +1.7 in |
| Revs per mile | 751.1 | 736.0 | −15.1 |
Verdict: close match
Within the 3% rule of thumb, so the speedometer, gearing and ride height change little. Going from 215/70R15 to 225/70R15 is a 2.1% increase in overall height (+0.55 in), and the vehicle sits about 0.28 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 | 56.1 mph | +1.1 mph |
| 60 mph | 61.2 mph | +1.2 mph |
| 65 mph | 66.3 mph | +1.3 mph |
| 70 mph | 71.4 mph | +1.4 mph |
| 75 mph | 76.5 mph | +1.5 mph |
Odometer: 1,000 indicated miles is 1,021 real miles, and 10,000 is 10,205.
The math
215/70R15: 15 + 2 × (215 × 70% ÷ 25.4) = 26.85 in. 225/70R15: 15 + 2 × (225 × 70% ÷ 25.4) = 27.40 in. Change = 27.40 ÷ 26.85 − 1 = +2.05%. True speed at 60 = 60 × 27.40 ÷ 26.85 = 61.23 mph.
Check next
- Regear and RPM at cruise for this swap
- Speedometer and odometer correction
- Other sizes within ±3% of 215/70R15
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: 215/70R15 · 225/70R15. More swaps: all tire size comparisons.