Comparison
235/60 R18 vs 255/45 R19
Switching from 235/60 R18 to 255/45 R19 is a plus-1 upgrade that wraps a shorter sidewall around a larger 19-inch wheel. This sizing approach noticeably changes overall diameter compared to OEM. The shorter sidewall gives the tire a firmer, more responsive feel and sharpens steering input.
The speedometer error is noticeable and may warrant a recalibration if you rely on indicated speed. Diameter delta falls in the cautious 3–5% range, where speedometer recalibration and a careful clearance check are worth doing.
TakeCommon upgrade for sportier handling and a tighter wheel-gap look on the same vehicle.
Quick math: 255/45 R19 is 27.1 mm shorter than 235/60 R18, shifting the speedometer by -3.67%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
-27.1 mm
-3.67%
Speedometer at 100
96.3 km/h
-3.67% error
Ground clearance
-13.6 mm
ride height delta
Sidewall change
-26.3 mm
revs/km: 447.0
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/compare/235-60-r18-vs-255-45-r19Detailed comparison
| Metric | 235/60 R18 | 255/45 R19 | Difference |
|---|---|---|---|
| Overall diameter | 739.2 mm | 712.1 mm | -27.1 mm (-3.67%) |
| Sidewall height | 141.0 mm | 114.8 mm | -26.3 mm |
| Circumference | 2.322 m | 2.237 m | -85.1 mm |
| Revs / km | 430.6 | 447.0 | +16.4 |
| Ground clearance | reference | -13.6 mm | -13.6 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 96.3 km/h | -3.67 km/h |
Verdict: warning
Between 3% and 5% — noticeable speedometer drift; recalibration may be advisable.
Speedometer impact
At a true 100 km/h, your dashboard will read 96.3 km/h after switching to 255/45 R19 — a -3.67% offset. Use the speedometer error calculator to recheck for other indicated speeds, and the speedometer error guide for the full background.
Ground clearance change
The new tire's half-diameter changes ride height by -13.6 mm. Small differences are absorbed by suspension travel, but anything beyond ±10 mm can affect headlight aim, fender clearance and bump-stop margin. See the plus-sizing guide before committing.
Back to
235/60 R18
Back to
255/45 R19
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