275/40R19 vs 175/55R20 tire size
175/55R20 vs 275/40R19, diameter
-0.3% shorter
- Speedometer
- 60.2 mph
- At a true 60 mph
- Diameter
- 27.58 in
- Was 27.66 in
- Revs per mile
- 731
- Was 729
- 3% guideline
- Within
Car built for 275/40R19, now on 175/55R20.
275/40R19 and 175/55R20
| Measure | 275/40R19 | 175/55R20 | Difference |
|---|---|---|---|
| Width, mm | 275 | 175 | -100 |
| Sidewall, % of width | 40 | 55 | +15 |
| Rim, in | 19 | 20 | +1 |
| Section height, in | 4.33 | 3.79 | -0.54 |
| Diameter, in | 27.66 | 27.58 | -0.08 (-0.3%) |
| Circumference, in | 86.9 | 86.6 | -0.3 |
| Revs per mile | 729 | 731 | +2 (+0.3%) |
Fitting 175/55R20 instead of 275/40R19
Within the usual 3% diameter guideline.
- Needs 20 in wheels.
- Shorter sidewall: 0.5 in less.
Cars with 275/40R19
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