265/35R20 vs 275/30R21 tire size
275/30R21 vs 265/35R20, diameter
+0.7% taller
- Speedometer
- 59.6 mph
- At a true 60 mph
- Diameter
- 27.50 in
- Was 27.30 in
- Revs per mile
- 733
- Was 739
- 3% guideline
- Within
Car built for 265/35R20, now on 275/30R21.
265/35R20 and 275/30R21
| Measure | 265/35R20 | 275/30R21 | Difference |
|---|---|---|---|
| Width, mm | 265 | 275 | +10 |
| Sidewall, % of width | 35 | 30 | -5 |
| Rim, in | 20 | 21 | +1 |
| Section height, in | 3.65 | 3.25 | -0.40 |
| Diameter, in | 27.30 | 27.50 | +0.19 (+0.7%) |
| Circumference, in | 85.8 | 86.4 | +0.6 |
| Revs per mile | 739 | 733 | -5 (-0.7%) |
Fitting 275/30R21 instead of 265/35R20
Within the usual 3% diameter guideline.
- Needs 21 in wheels.
Cars with 265/35R20
Cars with 275/30R21
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