245/35R21 vs 255/35R21 tire size
255/35R21 vs 245/35R21, diameter
+1.0% taller
- Speedometer
- 59.4 mph
- At a true 60 mph
- Diameter
- 28.03 in
- Was 27.75 in
- Revs per mile
- 720
- Was 727
- 3% guideline
- Within
Car built for 245/35R21, now on 255/35R21.
245/35R21 and 255/35R21
| Measure | 245/35R21 | 255/35R21 | Difference |
|---|---|---|---|
| Width, mm | 245 | 255 | +10 |
| Sidewall, % of width | 35 | 35 | 0 |
| Rim, in | 21 | 21 | 0 |
| Section height, in | 3.38 | 3.51 | +0.14 |
| Diameter, in | 27.75 | 28.03 | +0.28 (+1.0%) |
| Circumference, in | 87.2 | 88.1 | +0.9 |
| Revs per mile | 727 | 720 | -7 (-1.0%) |
Fitting 255/35R21 instead of 245/35R21
Within the usual 3% diameter guideline.
Cars with 245/35R21
Cars with 255/35R21
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