ElpiAuto205/55R16 vs 225/55R16
225/55R16 is 0.87″ (22 mm) taller than 205/55R16, a 3.5% difference in overall diameter — outside the ±3% band, so expect the speedometer to drift and check for rubbing before fitting.
| Measurement | 205/55R16 | 225/55R16 | Difference | % |
|---|---|---|---|---|
| Overall diameter | 24.88″ | 25.74″ | +0.87″ | +3.5% |
| Section width | 8.07″ | 8.86″ | +0.79″ | +9.8% |
| Sidewall height | 4.44″ | 4.87″ | +0.43″ | +9.8% |
| Circumference | 78.16″ | 80.88″ | +2.72″ | +3.5% |
| Revs per mile | 810.7 | 783.4 | −27.3 | −3.4% |
| Revs per km | 503.7 | 486.8 | −16.9 | −3.4% |
Speedometer: with 205/55R16 as the original, 225/55R16 makes an indicated 60 mph really about 62.1 mph, and the axle sits ~0.43″ higher.
Reading this comparison
The overall diameter is what matters here: 225/55R16 is the taller tire. It sets ride height, gearing and how far the tire travels per revolution — which is what the speedometer and odometer count. Width and sidewall change fit and feel (a wider tire needs a wider wheel and more clearance; a shorter sidewall sharpens steering) but not the gearing.
Figures are geometric estimates from the size codes; real moulded tires vary by brand by 1–3%. Confirm load rating, wheel width and physical clearance on your vehicle before fitting. To compare any other two sizes, use the tire size comparison tool; to decode one size and see what else fits its wheel, the tire size calculator.