215/45R20 vs 245/35R21 tire size
245/35R21 vs 215/45R20, diameter
+0.5% taller
- Speedometer
- 59.7 mph
- At a true 60 mph
- Diameter
- 27.75 in
- Was 27.62 in
- Revs per mile
- 727
- Was 730
- 3% guideline
- Within
Car built for 215/45R20, now on 245/35R21.
215/45R20 and 245/35R21
| Measure | 215/45R20 | 245/35R21 | Difference |
|---|---|---|---|
| Width, mm | 215 | 245 | +30 |
| Sidewall, % of width | 45 | 35 | -10 |
| Rim, in | 20 | 21 | +1 |
| Section height, in | 3.81 | 3.38 | -0.43 |
| Diameter, in | 27.62 | 27.75 | +0.13 (+0.5%) |
| Circumference, in | 86.8 | 87.2 | +0.4 |
| Revs per mile | 730 | 727 | -4 (-0.5%) |
Fitting 245/35R21 instead of 215/45R20
Within the usual 3% diameter guideline.
- Needs 21 in wheels.
- 30 mm wider. Check rubbing at full lock.
Cars with 215/45R20
Cars with 245/35R21
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