185/65R15 vs 185/55R16 tire size
185/55R16 vs 185/65R15, diameter
-1.9% shorter
- Speedometer
- 61.1 mph
- At a true 60 mph
- Diameter
- 24.01 in
- Was 24.47 in
- Revs per mile
- 840
- Was 824
- 3% guideline
- Within
Car built for 185/65R15, now on 185/55R16.
185/65R15 and 185/55R16
| Measure | 185/65R15 | 185/55R16 | Difference |
|---|---|---|---|
| Width, mm | 185 | 185 | 0 |
| Sidewall, % of width | 65 | 55 | -10 |
| Rim, in | 15 | 16 | +1 |
| Section height, in | 4.73 | 4.01 | -0.73 |
| Diameter, in | 24.47 | 24.01 | -0.46 (-1.9%) |
| Circumference, in | 76.9 | 75.4 | -1.4 |
| Revs per mile | 824 | 840 | +16 (+1.9%) |
Fitting 185/55R16 instead of 185/65R15
Within the usual 3% diameter guideline.
- Needs 16 in wheels.
- Shorter sidewall: 0.7 in less.
Cars with 185/65R15
Cars with 185/55R16
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