Comparison
255/55 R18 vs 225/40 R19
Compared to 255/55 R18, 225/40 R19 is 75.1 mm shorter and changes the speedometer reading by -10.18%.
Current Tire
255/55R18
New Tire
225/40R19
255/55 R18
225/40 R19
Ground line · scaled comparison
Not Recommended
Over 5% — speedometer & ABS may misread
Diameter change
-75.1 mm
-10.18%
Speedometer at 100
89.8 km/h
-10.18% error
Ground clearance
-37.6 mm
ride height delta
Sidewall change
-50.3 mm
revs/km: 480.4
Permalink for this comparison:
/compare/255-55-r18-vs-225-40-r19Detailed comparison
| Metric | 255/55 R18 | 225/40 R19 | Difference |
|---|---|---|---|
| Overall diameter | 737.7 mm | 662.6 mm | -75.1 mm (-10.18%) |
| Sidewall height | 140.3 mm | 90.0 mm | -50.3 mm |
| Circumference | 2.318 m | 2.082 m | -235.9 mm |
| Revs / km | 431.5 | 480.4 | +48.9 |
| Ground clearance | reference | -37.6 mm | -37.6 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 89.8 km/h | -10.18 km/h |
Verdict: danger
Over 5% diameter difference — likely to affect speedometer accuracy, ABS calibration and gearing. Not recommended without professional review.
Back to
255/55 R18
Back to
225/40 R19