Comparison
255/40 R19 vs 275/40 R19
Stepping from 255/40 R19 to 275/40 R19 keeps the 19-inch wheel but widens the section by 20 mm. This alternative fitment trims or stretches rolling diameter by a small margin. The wider section adds contact patch and lateral stability, while eating into fender and suspension clearance.
The speedometer offset is small but measurable; worth keeping in mind if you watch the dash closely. Overall the swap sits inside the safe ±3% diameter window, so ABS, traction control and gearing behave normally.
TakeReasonable performance-leaning swap as long as fender and suspension clearance check out.
Quick math: 275/40 R19 is 16.0 mm taller than 255/40 R19, shifting the speedometer by +2.33%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
+16.0 mm
2.33%
Speedometer at 100
102.3 km/h
+2.33% error
Ground clearance
+8.0 mm
ride height delta
Sidewall change
+8.0 mm
revs/km: 453.0
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/compare/255-40-r19-vs-275-40-r19Detailed comparison
| Metric | 255/40 R19 | 275/40 R19 | Difference |
|---|---|---|---|
| Overall diameter | 686.6 mm | 702.6 mm | +16.0 mm (+2.33%) |
| Sidewall height | 102.0 mm | 110.0 mm | +8.0 mm |
| Circumference | 2.157 m | 2.207 m | +50.3 mm |
| Revs / km | 463.6 | 453.0 | -10.6 |
| Ground clearance | reference | +8.0 mm | +8.0 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 102.3 km/h | +2.33 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 102.3 km/h after switching to 275/40 R19 — a +2.33% 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 +8.0 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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255/40 R19
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275/40 R19
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