235/65R17 vs 245/65R17 at a glance
| Measure | 235/65R17 (current) | 245/65R17 (new) | Difference |
|---|---|---|---|
| Overall height | 29.03 in | 29.54 in | +0.51 in (+1.76%) |
| Width | 9.25 in (235 mm) | 9.65 in (245 mm) | +10 mm |
| Sidewall | 6.01 in | 6.27 in | +0.26 in |
| Wheel | 17 in | 17 in | +0 in |
| Circumference | 91.2 in | 92.8 in | +1.6 in |
| Revs per mile | 694.8 | 682.8 | −12.0 |
Verdict: close match
Within the 3% rule of thumb, so the speedometer, gearing and ride height change little. Going from 235/65R17 to 245/65R17 is a 1.8% 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 | 35.6 mph | +0.6 mph |
| 45 mph | 45.8 mph | +0.8 mph |
| 55 mph | 56.0 mph | +1.0 mph |
| 60 mph | 61.1 mph | +1.1 mph |
| 65 mph | 66.1 mph | +1.1 mph |
| 70 mph | 71.2 mph | +1.2 mph |
| 75 mph | 76.3 mph | +1.3 mph |
Odometer: 1,000 indicated miles is 1,018 real miles, and 10,000 is 10,176.
The math
235/65R17: 17 + 2 × (235 × 65% ÷ 25.4) = 29.03 in. 245/65R17: 17 + 2 × (245 × 65% ÷ 25.4) = 29.54 in. Change = 29.54 ÷ 29.03 − 1 = +1.76%. True speed at 60 = 60 × 29.54 ÷ 29.03 = 61.06 mph.
Check next
- Regear and RPM at cruise for this swap
- Speedometer and odometer correction
- Other sizes within ±3% of 235/65R17
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: 235/65R17 · 245/65R17. More swaps: all tire size comparisons.