295/45R20 vs 275/45R21 tire size
275/45R21 vs 295/45R20, diameter
+1.0% taller
- Speedometer
- 59.4 mph
- At a true 60 mph
- Diameter
- 30.74 in
- Was 30.45 in
- Revs per mile
- 656
- Was 662
- 3% guideline
- Within
Car built for 295/45R20, now on 275/45R21.
295/45R20 and 275/45R21
| Measure | 295/45R20 | 275/45R21 | Difference |
|---|---|---|---|
| Width, mm | 295 | 275 | -20 |
| Sidewall, % of width | 45 | 45 | 0 |
| Rim, in | 20 | 21 | +1 |
| Section height, in | 5.23 | 4.87 | -0.35 |
| Diameter, in | 30.45 | 30.74 | +0.29 (+1.0%) |
| Circumference, in | 95.7 | 96.6 | +0.9 |
| Revs per mile | 662 | 656 | -6 (-0.9%) |
Fitting 275/45R21 instead of 295/45R20
Within the usual 3% diameter guideline.
- Needs 21 in wheels.
Cars with 295/45R20
Cars with 275/45R21
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