Comparison
225/45 R19 vs 255/45 R19
Stepping from 225/45 R19 to 255/45 R19 keeps the 19-inch wheel but widens the section by 30 mm. This swap noticeably changes overall diameter compared to OEM.
The speedometer error is noticeable and may warrant a recalibration if you rely on indicated speed. The wider section adds contact patch and lateral stability, while eating into fender and suspension clearance. Diameter delta falls in the cautious 3–5% range, where speedometer recalibration and a careful clearance check are worth doing.
TakeReasonable performance-leaning swap as long as fender and suspension clearance check out.
Quick math: 255/45 R19 is 27.0 mm taller than 225/45 R19, shifting the speedometer by +3.94%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
+27.0 mm
3.94%
Speedometer at 100
103.9 km/h
+3.94% error
Ground clearance
+13.5 mm
ride height delta
Sidewall change
+13.5 mm
revs/km: 447.0
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/compare/225-45-r19-vs-255-45-r19Detailed comparison
| Metric | 225/45 R19 | 255/45 R19 | Difference |
|---|---|---|---|
| Overall diameter | 685.1 mm | 712.1 mm | +27.0 mm (+3.94%) |
| Sidewall height | 101.3 mm | 114.8 mm | +13.5 mm |
| Circumference | 2.152 m | 2.237 m | +84.8 mm |
| Revs / km | 464.6 | 447.0 | -17.6 |
| Ground clearance | reference | +13.5 mm | +13.5 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 103.9 km/h | +3.94 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 103.9 km/h after switching to 255/45 R19 — a +3.94% 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 +13.5 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.
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225/45 R19
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255/45 R19
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