Comparison
245/45 R19 vs 255/45 R19
Stepping from 245/45 R19 to 255/45 R19 keeps the 19-inch wheel but widens the section by 10 mm. This wheel and tire pairing preserves rolling diameter within a hair of the original.
The speedometer offset is mild and well inside what most cars can tolerate without recalibration. The wider section adds contact patch and lateral stability, while eating into fender and suspension clearance. Diameter change stays inside the conservative ±3% safety window — an OEM-safe fitment on most vehicles.
TakeUseful when extra dry grip and stance matter more than a small fuel-economy hit.
Quick math: 255/45 R19 is 9.0 mm taller than 245/45 R19, shifting the speedometer by +1.28%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
+9.0 mm
1.28%
Speedometer at 100
101.3 km/h
+1.28% error
Ground clearance
+4.5 mm
ride height delta
Sidewall change
+4.5 mm
revs/km: 447.0
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/compare/245-45-r19-vs-255-45-r19Detailed comparison
| Metric | 245/45 R19 | 255/45 R19 | Difference |
|---|---|---|---|
| Overall diameter | 703.1 mm | 712.1 mm | +9.0 mm (+1.28%) |
| Sidewall height | 110.3 mm | 114.8 mm | +4.5 mm |
| Circumference | 2.209 m | 2.237 m | +28.3 mm |
| Revs / km | 452.7 | 447.0 | -5.7 |
| Ground clearance | reference | +4.5 mm | +4.5 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 101.3 km/h | +1.28 km/h |
Verdict: excellent
Within ±3% — speedometer, ABS and traction control should behave normally.
Speedometer impact
At a true 100 km/h, your dashboard will read 101.3 km/h after switching to 255/45 R19 — a +1.28% 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 +4.5 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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245/45 R19
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255/45 R19
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