Comparison
245/45 R19 vs 255/50 R19
On the same 19-inch wheel, 255/50 R19 grows the section width by 10 mm versus 245/45 R19. This tire combination swings rolling diameter far enough to feel on the road. The speedometer error is noticeable and may warrant a recalibration if you rely on indicated speed. Extra sidewall absorbs impacts more readily — a sensible bias for daily commuting and broken pavement. The 3–5% diameter gap puts this in caution territory: doable on many cars, but verify clearance and consider recalibration.
TakeReasonable performance-leaning swap as long as fender and suspension clearance check out.
Quick math: 255/50 R19 is 34.5 mm taller than 245/45 R19, shifting the speedometer by +4.91%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
+34.5 mm
4.91%
Speedometer at 100
104.9 km/h
+4.91% error
Ground clearance
+17.3 mm
ride height delta
Sidewall change
+17.3 mm
revs/km: 431.5
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/compare/245-45-r19-vs-255-50-r19Detailed comparison
| Metric | 245/45 R19 | 255/50 R19 | Difference |
|---|---|---|---|
| Overall diameter | 703.1 mm | 737.6 mm | +34.5 mm (+4.91%) |
| Sidewall height | 110.3 mm | 127.5 mm | +17.3 mm |
| Circumference | 2.209 m | 2.317 m | +108.4 mm |
| Revs / km | 452.7 | 431.5 | -21.2 |
| Ground clearance | reference | +17.3 mm | +17.3 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 104.9 km/h | +4.91 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 104.9 km/h after switching to 255/50 R19 — a +4.91% 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 +17.3 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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245/45 R19
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255/50 R19
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