245/35R19 vs 255/30R20 tire size
255/30R20 vs 245/35R19, diameter
+1.1% taller
- Speedometer
- 59.4 mph
- At a true 60 mph
- Diameter
- 26.02 in
- Was 25.75 in
- Revs per mile
- 775
- Was 783
- 3% guideline
- Within
Car built for 245/35R19, now on 255/30R20.
245/35R19 and 255/30R20
| Measure | 245/35R19 | 255/30R20 | Difference |
|---|---|---|---|
| Width, mm | 245 | 255 | +10 |
| Sidewall, % of width | 35 | 30 | -5 |
| Rim, in | 19 | 20 | +1 |
| Section height, in | 3.38 | 3.01 | -0.36 |
| Diameter, in | 25.75 | 26.02 | +0.27 (+1.1%) |
| Circumference, in | 80.9 | 81.8 | +0.9 |
| Revs per mile | 783 | 775 | -8 (-1.0%) |
Fitting 255/30R20 instead of 245/35R19
Within the usual 3% diameter guideline.
- Needs 20 in wheels.
Cars with 245/35R19
Cars with 255/30R20
What this cannot tell you
Diameter within 3% is a common shop guideline, not a maker spec.
Load index, offset and clearance are not in this data.
- Two or more sources agree
- One source
- Model-level or estimate
- Sources differ