245/45R19 vs 175/55R20 tire size
175/55R20 vs 245/45R19, diameter
-0.4% shorter
- Speedometer
- 60.2 mph
- At a true 60 mph
- Diameter
- 27.58 in
- Was 27.68 in
- Revs per mile
- 731
- Was 729
- 3% guideline
- Within
Car built for 245/45R19, now on 175/55R20.
245/45R19 and 175/55R20
| Measure | 245/45R19 | 175/55R20 | Difference |
|---|---|---|---|
| Width, mm | 245 | 175 | -70 |
| Sidewall, % of width | 45 | 55 | +10 |
| Rim, in | 19 | 20 | +1 |
| Section height, in | 4.34 | 3.79 | -0.55 |
| Diameter, in | 27.68 | 27.58 | -0.10 (-0.4%) |
| Circumference, in | 87.0 | 86.6 | -0.3 |
| Revs per mile | 729 | 731 | +3 (+0.4%) |
Fitting 175/55R20 instead of 245/45R19
Within the usual 3% diameter guideline.
- Needs 20 in wheels.
- Shorter sidewall: 0.6 in less.
Cars with 245/45R19
Cars with 175/55R20
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