Comparison
325/55 R16 vs 255/55 R18
Compared to 325/55 R16, 255/55 R18 is 26.2 mm shorter and changes the speedometer reading by -3.43%.
Current Tire
325/55R16
New Tire
255/55R18
325/55 R16
255/55 R18
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
-26.2 mm
-3.43%
Speedometer at 100
96.6 km/h
-3.43% error
Ground clearance
-13.1 mm
ride height delta
Sidewall change
-38.5 mm
revs/km: 431.5
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/compare/325-55-r16-vs-255-55-r18Detailed comparison
| Metric | 325/55 R16 | 255/55 R18 | Difference |
|---|---|---|---|
| Overall diameter | 763.9 mm | 737.7 mm | -26.2 mm (-3.43%) |
| Sidewall height | 178.8 mm | 140.3 mm | -38.5 mm |
| Circumference | 2.400 m | 2.318 m | -82.3 mm |
| Revs / km | 416.7 | 431.5 | +14.8 |
| Ground clearance | reference | -13.1 mm | -13.1 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 96.6 km/h | -3.43 km/h |
Verdict: warning
Between 3% and 5% — noticeable speedometer drift; recalibration may be advisable.
Back to
325/55 R16
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255/55 R18