265/40R21 vs 275/40R21 tire size
275/40R21 vs 265/40R21, diameter
+1.1% taller
- Speedometer
- 59.4 mph
- At a true 60 mph
- Diameter
- 29.66 in
- Was 29.35 in
- Revs per mile
- 680
- Was 687
- 3% guideline
- Within
Car built for 265/40R21, now on 275/40R21.
265/40R21 and 275/40R21
| Measure | 265/40R21 | 275/40R21 | Difference |
|---|---|---|---|
| Width, mm | 265 | 275 | +10 |
| Sidewall, % of width | 40 | 40 | 0 |
| Rim, in | 21 | 21 | 0 |
| Section height, in | 4.17 | 4.33 | +0.16 |
| Diameter, in | 29.35 | 29.66 | +0.31 (+1.1%) |
| Circumference, in | 92.2 | 93.2 | +1.0 |
| Revs per mile | 687 | 680 | -7 (-1.1%) |
Fitting 275/40R21 instead of 265/40R21
Within the usual 3% diameter guideline.
Cars with 265/40R21
Cars with 275/40R21
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