235/70R16 vs 245/70R16 at a glance
| Measure | 235/70R16 (current) | 245/70R16 (new) | Difference |
|---|---|---|---|
| Overall height | 28.95 in | 29.50 in | +0.55 in (+1.90%) |
| Width | 9.25 in (235 mm) | 9.65 in (245 mm) | +10 mm |
| Sidewall | 6.48 in | 6.75 in | +0.28 in |
| Wheel | 16 in | 16 in | +0 in |
| Circumference | 91.0 in | 92.7 in | +1.7 in |
| Revs per mile | 696.6 | 683.6 | −13.0 |
Verdict: close match
Within the 3% rule of thumb, so the speedometer, gearing and ride height change little. Going from 235/70R16 to 245/70R16 is a 1.9% 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 | 56.0 mph | +1.0 mph |
| 60 mph | 61.1 mph | +1.1 mph |
| 65 mph | 66.2 mph | +1.2 mph |
| 70 mph | 71.3 mph | +1.3 mph |
| 75 mph | 76.4 mph | +1.4 mph |
Odometer: 1,000 indicated miles is 1,019 real miles, and 10,000 is 10,190.
The math
235/70R16: 16 + 2 × (235 × 70% ÷ 25.4) = 28.95 in. 245/70R16: 16 + 2 × (245 × 70% ÷ 25.4) = 29.50 in. Change = 29.50 ÷ 28.95 − 1 = +1.90%. True speed at 60 = 60 × 29.50 ÷ 28.95 = 61.14 mph.
Check next
- Regear and RPM at cruise for this swap
- Speedometer and odometer correction
- Other sizes within ±3% of 235/70R16
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: 235/70R16 · 245/70R16. More swaps: all tire size comparisons.