Comparison
255/45 R19 vs 275/40 R19
Stepping from 255/45 R19 to 275/40 R19 keeps the 19-inch wheel but widens the section by 20 mm. This alternative fitment lands within OEM rolling-diameter tolerance. Dashboard speed shifts only marginally — within the noise of normal OEM tolerance. Expect a more planted steering feel, at the cost of some of the cushioning a taller sidewall provides. Diameter change stays inside the conservative ±3% safety window — an OEM-safe fitment on most vehicles.
TakeReasonable performance-leaning swap as long as fender and suspension clearance check out.
Quick math: 275/40 R19 is 9.5 mm shorter than 255/45 R19, shifting the speedometer by -1.33%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-9.5 mm
-1.33%
Speedometer at 100
98.7 km/h
-1.33% error
Ground clearance
-4.8 mm
ride height delta
Sidewall change
-4.8 mm
revs/km: 453.0
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/compare/255-45-r19-vs-275-40-r19Detailed comparison
| Metric | 255/45 R19 | 275/40 R19 | Difference |
|---|---|---|---|
| Overall diameter | 712.1 mm | 702.6 mm | -9.5 mm (-1.33%) |
| Sidewall height | 114.8 mm | 110.0 mm | -4.8 mm |
| Circumference | 2.237 m | 2.207 m | -29.8 mm |
| Revs / km | 447.0 | 453.0 | +6.0 |
| Ground clearance | reference | -4.8 mm | -4.8 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 98.7 km/h | -1.33 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 98.7 km/h after switching to 275/40 R19 — a -1.33% 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 -4.8 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
255/45 R19
Back to
275/40 R19
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