225/45R17 vs 235/45R17 at a glance
| Measure | 225/45R17 (current) | 235/45R17 (new) | Difference |
|---|---|---|---|
| Overall height | 24.97 in | 25.33 in | +0.35 in (+1.42%) |
| Width | 8.86 in (225 mm) | 9.25 in (235 mm) | +10 mm |
| Sidewall | 3.99 in | 4.16 in | +0.18 in |
| Wheel | 17 in | 17 in | +0 in |
| Circumference | 78.5 in | 79.6 in | +1.1 in |
| Revs per mile | 807.6 | 796.3 | −11.3 |
Verdict: close match
Within the 3% rule of thumb, so the speedometer, gearing and ride height change little. Going from 225/45R17 to 235/45R17 is a 1.4% increase in overall height (+0.35 in), and the vehicle sits about 0.18 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 | 35.5 mph | +0.5 mph |
| 45 mph | 45.6 mph | +0.6 mph |
| 55 mph | 55.8 mph | +0.8 mph |
| 60 mph | 60.9 mph | +0.9 mph |
| 65 mph | 65.9 mph | +0.9 mph |
| 70 mph | 71.0 mph | +1.0 mph |
| 75 mph | 76.1 mph | +1.1 mph |
Odometer: 1,000 indicated miles is 1,014 real miles, and 10,000 is 10,142.
The math
225/45R17: 17 + 2 × (225 × 45% ÷ 25.4) = 24.97 in. 235/45R17: 17 + 2 × (235 × 45% ÷ 25.4) = 25.33 in. Change = 25.33 ÷ 24.97 − 1 = +1.42%. True speed at 60 = 60 × 25.33 ÷ 24.97 = 60.85 mph.
Check next
- Regear and RPM at cruise for this swap
- Speedometer and odometer correction
- Other sizes within ±3% of 225/45R17
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: 225/45R17 · 235/45R17. More swaps: all tire size comparisons.