265/60R20 vs 275/55R21 tire size
275/55R21 vs 265/60R20, diameter
+1.2% taller
- Speedometer
- 59.3 mph
- At a true 60 mph
- Diameter
- 32.91 in
- Was 32.52 in
- Revs per mile
- 613
- Was 620
- 3% guideline
- Within
Car built for 265/60R20, now on 275/55R21.
265/60R20 and 275/55R21
| Measure | 265/60R20 | 275/55R21 | Difference |
|---|---|---|---|
| Width, mm | 265 | 275 | +10 |
| Sidewall, % of width | 60 | 55 | -5 |
| Rim, in | 20 | 21 | +1 |
| Section height, in | 6.26 | 5.95 | -0.31 |
| Diameter, in | 32.52 | 32.91 | +0.39 (+1.2%) |
| Circumference, in | 102.2 | 103.4 | +1.2 |
| Revs per mile | 620 | 613 | -7 (-1.2%) |
Fitting 275/55R21 instead of 265/60R20
Within the usual 3% diameter guideline.
- Needs 21 in wheels.
Cars with 265/60R20
Cars with 275/55R21
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