225/45R20 vs 285/35R20 tire size
285/35R20 vs 225/45R20, diameter
-0.4% shorter
- Speedometer
- 60.3 mph
- At a true 60 mph
- Diameter
- 27.85 in
- Was 27.97 in
- Revs per mile
- 724
- Was 721
- 3% guideline
- Within
Car built for 225/45R20, now on 285/35R20.
225/45R20 and 285/35R20
| Measure | 225/45R20 | 285/35R20 | Difference |
|---|---|---|---|
| Width, mm | 225 | 285 | +60 |
| Sidewall, % of width | 45 | 35 | -10 |
| Rim, in | 20 | 20 | 0 |
| Section height, in | 3.99 | 3.93 | -0.06 |
| Diameter, in | 27.97 | 27.85 | -0.12 (-0.4%) |
| Circumference, in | 87.9 | 87.5 | -0.4 |
| Revs per mile | 721 | 724 | +3 (+0.4%) |
Fitting 285/35R20 instead of 225/45R20
Within the usual 3% diameter guideline.
- 60 mm wider. Check rubbing at full lock.
Cars with 225/45R20
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