255/35R19 vs 245/30R20 tire size
245/30R20 vs 255/35R19, diameter
-0.9% shorter
- Speedometer
- 60.6 mph
- At a true 60 mph
- Diameter
- 25.79 in
- Was 26.03 in
- Revs per mile
- 782
- Was 775
- 3% guideline
- Within
Car built for 255/35R19, now on 245/30R20.
255/35R19 and 245/30R20
| Measure | 255/35R19 | 245/30R20 | Difference |
|---|---|---|---|
| Width, mm | 255 | 245 | -10 |
| Sidewall, % of width | 35 | 30 | -5 |
| Rim, in | 19 | 20 | +1 |
| Section height, in | 3.51 | 2.89 | -0.62 |
| Diameter, in | 26.03 | 25.79 | -0.24 (-0.9%) |
| Circumference, in | 81.8 | 81.0 | -0.8 |
| Revs per mile | 775 | 782 | +7 (+0.9%) |
Fitting 245/30R20 instead of 255/35R19
Within the usual 3% diameter guideline.
- Needs 20 in wheels.
- Shorter sidewall: 0.6 in less.
Cars with 255/35R19
Cars with 245/30R20
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