295/45R20 vs 235/50R21 tire size
235/50R21 vs 295/45R20, diameter
-0.7% shorter
- Speedometer
- 60.4 mph
- At a true 60 mph
- Diameter
- 30.25 in
- Was 30.45 in
- Revs per mile
- 667
- Was 662
- 3% guideline
- Within
Car built for 295/45R20, now on 235/50R21.
295/45R20 and 235/50R21
| Measure | 295/45R20 | 235/50R21 | Difference |
|---|---|---|---|
| Width, mm | 295 | 235 | -60 |
| Sidewall, % of width | 45 | 50 | +5 |
| Rim, in | 20 | 21 | +1 |
| Section height, in | 5.23 | 4.63 | -0.60 |
| Diameter, in | 30.45 | 30.25 | -0.20 (-0.7%) |
| Circumference, in | 95.7 | 95.0 | -0.6 |
| Revs per mile | 662 | 667 | +4 (+0.7%) |
Fitting 235/50R21 instead of 295/45R20
Within the usual 3% diameter guideline.
- Needs 21 in wheels.
- Shorter sidewall: 0.6 in less.
Cars with 295/45R20
Cars with 235/50R21
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