ElpiAuto215/55R16 vs 225/55R16
225/55R16 is 0.43″ (11 mm) taller than 215/55R16, a 1.7% difference in overall diameter — right at the edge of the ±3% band — fine on most cars, but check clearance at full lock and full suspension compression.
| Measurement | 215/55R16 | 225/55R16 | Difference | % |
|---|---|---|---|---|
| Overall diameter | 25.31″ | 25.74″ | +0.43″ | +1.7% |
| Section width | 8.46″ | 8.86″ | +0.39″ | +4.7% |
| Sidewall height | 4.66″ | 4.87″ | +0.22″ | +4.7% |
| Circumference | 79.52″ | 80.88″ | +1.36″ | +1.7% |
| Revs per mile | 796.8 | 783.4 | −13.4 | −1.7% |
| Revs per km | 495.1 | 486.8 | −8.3 | −1.7% |
Speedometer: with 215/55R16 as the original, 225/55R16 makes an indicated 60 mph really about 61.0 mph, and the axle sits ~0.22″ 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.