245/60R20 vs 255/60R20 tire size
255/60R20 vs 245/60R20, diameter
+1.5% taller
- Speedometer
- 59.1 mph
- At a true 60 mph
- Diameter
- 32.05 in
- Was 31.57 in
- Revs per mile
- 629
- Was 639
- 3% guideline
- Within
Car built for 245/60R20, now on 255/60R20.
245/60R20 and 255/60R20
| Measure | 245/60R20 | 255/60R20 | Difference |
|---|---|---|---|
| Width, mm | 245 | 255 | +10 |
| Sidewall, % of width | 60 | 60 | 0 |
| Rim, in | 20 | 20 | 0 |
| Section height, in | 5.79 | 6.02 | +0.24 |
| Diameter, in | 31.57 | 32.05 | +0.47 (+1.5%) |
| Circumference, in | 99.2 | 100.7 | +1.5 |
| Revs per mile | 639 | 629 | -9 (-1.5%) |
Fitting 255/60R20 instead of 245/60R20
Within the usual 3% diameter guideline.
Cars with 245/60R20
Cars with 255/60R20
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