ElpiAuto285/50R20 vs 325/60R20
325/60R20 is 4.13″ (105 mm) taller than 285/50R20, a 13.2% difference in overall diameter — outside the ±3% band, so expect the speedometer to drift and check for rubbing before fitting.
The sidewall heights are very different — ride and steering feel will change noticeably even though the diameter is close.
| Measurement | 285/50R20 | 325/60R20 | Difference | % |
|---|---|---|---|---|
| Overall diameter | 31.22″ | 35.35″ | +4.13″ | +13.2% |
| Section width | 11.22″ | 12.80″ | +1.57″ | +14.0% |
| Sidewall height | 5.61″ | 7.68″ | +2.07″ | +36.8% |
| Circumference | 98.08″ | 111.07″ | +12.99″ | +13.2% |
| Revs per mile | 646.0 | 570.5 | −75.5 | −11.7% |
| Revs per km | 401.4 | 354.5 | −46.9 | −11.7% |
Speedometer: with 285/50R20 as the original, 325/60R20 makes an indicated 60 mph really about 67.9 mph, and the axle sits ~2.07″ higher.
Reading this comparison
The overall diameter is what matters here: 325/60R20 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.