ElpiAuto215/60R16 vs 235/50R18
235/50R18 is 1.09″ (28 mm) taller than 215/60R16, a 4.2% difference in overall diameter — outside the ±3% band, so expect the speedometer to drift and check for rubbing before fitting.
These sit on different wheel sizes — you'd be changing wheels too, not just tires.
| Measurement | 215/60R16 | 235/50R18 | Difference | % |
|---|---|---|---|---|
| Overall diameter | 26.16″ | 27.25″ | +1.09″ | +4.2% |
| Section width | 8.46″ | 9.25″ | +0.79″ | +9.3% |
| Sidewall height | 5.08″ | 4.63″ | −0.45″ | −8.9% |
| Circumference | 82.18″ | 85.61″ | +3.44″ | +4.2% |
| Revs per mile | 771.0 | 740.1 | −31.0 | −4.0% |
| Revs per km | 479.1 | 459.9 | −19.2 | −4.0% |
Speedometer: with 215/60R16 as the original, 235/50R18 makes an indicated 60 mph really about 62.5 mph, and the axle sits ~0.55″ higher.
Reading this comparison
The overall diameter is what matters here: 235/50R18 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.