ElpiAuto285/75R18 vs 295/65R18
295/65R18 is 1.73″ (44 mm) shorter than 285/75R18, a 5.0% difference in overall diameter — outside the ±3% band, so expect the speedometer to drift and check for rubbing before fitting.
| Measurement | 285/75R18 | 295/65R18 | Difference | % |
|---|---|---|---|---|
| Overall diameter | 34.83″ | 33.10″ | −1.73″ | −5.0% |
| Section width | 11.22″ | 11.61″ | +0.39″ | +3.5% |
| Sidewall height | 8.42″ | 7.55″ | −0.87″ | −10.3% |
| Circumference | 109.42″ | 103.98″ | −5.44″ | −5.0% |
| Revs per mile | 579.0 | 609.3 | +30.3 | +5.2% |
| Revs per km | 359.8 | 378.6 | +18.8 | +5.2% |
Speedometer: with 285/75R18 as the original, 295/65R18 makes an indicated 60 mph really about 57.0 mph, and the axle sits ~0.87″ lower.
Reading this comparison
The overall diameter is what matters here: 285/75R18 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.