ElpiAuto245/35R19 vs 255/35R19
255/35R19 is 0.28″ (7 mm) taller than 245/35R19, a 1.1% difference in overall diameter — comfortably inside the ±3% band most fitment guides use, so it swaps straight across for gearing and the speedometer.
| Measurement | 245/35R19 | 255/35R19 | Difference | % |
|---|---|---|---|---|
| Overall diameter | 25.75″ | 26.03″ | +0.28″ | +1.1% |
| Section width | 9.65″ | 10.04″ | +0.39″ | +4.1% |
| Sidewall height | 3.38″ | 3.51″ | +0.14″ | +4.1% |
| Circumference | 80.90″ | 81.77″ | +0.87″ | +1.1% |
| Revs per mile | 783.2 | 774.9 | −8.3 | −1.1% |
| Revs per km | 486.6 | 481.5 | −5.2 | −1.1% |
Speedometer: with 245/35R19 as the original, 255/35R19 makes an indicated 60 mph really about 60.6 mph, and the axle sits ~0.14″ higher.
Reading this comparison
The overall diameter is what matters here: 255/35R19 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.