235/65R16 vs 235/70R16 at a glance
| Measure | 235/65R16 (current) | 235/70R16 (new) | Difference |
|---|---|---|---|
| Overall height | 28.03 in | 28.95 in | +0.93 in (+3.30%) |
| Width | 9.25 in (235 mm) | 9.25 in (235 mm) | +0 mm |
| Sidewall | 6.01 in | 6.48 in | +0.46 in |
| Wheel | 16 in | 16 in | +0 in |
| Circumference | 88.1 in | 91.0 in | +2.9 in |
| Revs per mile | 719.6 | 696.6 | −23.0 |
Verdict: check clearance and speedometer
Over 3% and up to 5%: worth checking clearance, the speedometer and gearing before you buy. Going from 235/65R16 to 235/70R16 is a 3.3% increase in overall height (+0.93 in), and the vehicle sits about 0.46 in higher. The tire is the same width. 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 | 36.2 mph | +1.2 mph |
| 45 mph | 46.5 mph | +1.5 mph |
| 55 mph | 56.8 mph | +1.8 mph |
| 60 mph | 62.0 mph | +2.0 mph |
| 65 mph | 67.1 mph | +2.1 mph |
| 70 mph | 72.3 mph | +2.3 mph |
| 75 mph | 77.5 mph | +2.5 mph |
Odometer: 1,000 indicated miles is 1,033 real miles, and 10,000 is 10,330.
The math
235/65R16: 16 + 2 × (235 × 65% ÷ 25.4) = 28.03 in. 235/70R16: 16 + 2 × (235 × 70% ÷ 25.4) = 28.95 in. Change = 28.95 ÷ 28.03 − 1 = +3.30%. True speed at 60 = 60 × 28.95 ÷ 28.03 = 61.98 mph.
Check next
- Regear and RPM at cruise for this swap
- Speedometer and odometer correction
- Other sizes within ±3% of 235/65R16
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: 235/65R16 · 235/70R16. More swaps: all tire size comparisons.