Comparison
255/55 R18 vs 235/35 R19
Compared to 255/55 R18, 235/35 R19 is 90.6 mm shorter and changes the speedometer reading by -12.28%.
Current Tire
255/55R18
New Tire
235/35R19
255/55 R18
235/35 R19
Ground line · scaled comparison
Not Recommended
Over 5% — speedometer & ABS may misread
Diameter change
-90.6 mm
-12.28%
Speedometer at 100
87.7 km/h
-12.28% error
Ground clearance
-45.3 mm
ride height delta
Sidewall change
-58.0 mm
revs/km: 491.9
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/compare/255-55-r18-vs-235-35-r19Detailed comparison
| Metric | 255/55 R18 | 235/35 R19 | Difference |
|---|---|---|---|
| Overall diameter | 737.7 mm | 647.1 mm | -90.6 mm (-12.28%) |
| Sidewall height | 140.3 mm | 82.3 mm | -58.0 mm |
| Circumference | 2.318 m | 2.033 m | -284.6 mm |
| Revs / km | 431.5 | 491.9 | +60.4 |
| Ground clearance | reference | -45.3 mm | -45.3 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 87.7 km/h | -12.28 km/h |
Verdict: danger
Over 5% diameter difference — likely to affect speedometer accuracy, ABS calibration and gearing. Not recommended without professional review.
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255/55 R18
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235/35 R19