ElpiAuto225/45R17 vs 225/50R17
225/50R17 is 0.89″ (23 mm) taller than 225/45R17, a 3.5% difference in overall diameter — outside the ±3% band, so expect the speedometer to drift and check for rubbing before fitting.
| Measurement | 225/45R17 | 225/50R17 | Difference | % |
|---|---|---|---|---|
| Overall diameter | 24.97″ | 25.86″ | +0.89″ | +3.5% |
| Section width | 8.86″ | 8.86″ | — | |
| Sidewall height | 3.99″ | 4.43″ | +0.44″ | +11.1% |
| Circumference | 78.45″ | 81.24″ | +2.78″ | +3.5% |
| Revs per mile | 807.6 | 779.9 | −27.7 | −3.4% |
| Revs per km | 501.8 | 484.6 | −17.2 | −3.4% |
Speedometer: with 225/45R17 as the original, 225/50R17 makes an indicated 60 mph really about 62.1 mph, and the axle sits ~0.44″ higher.
Reading this comparison
The overall diameter is what matters here: 225/50R17 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.