Comparison
275/40 R18 vs 275/40 R19
Going from 275/40 R18 to 275/40 R19 steps up to a 19-inch rim while trimming sidewall to stay near OEM rolling diameter. This alternative fitment moves rolling diameter well outside the usual OEM tolerance.
Indicated speed will drift far enough that recalibration is worth considering. The larger wheel shows more of the brake hardware and tightens up the wheel-gap look. Diameter delta falls in the cautious 3–5% range, where speedometer recalibration and a careful clearance check are worth doing.
TakeCommon upgrade for sportier handling and a tighter wheel-gap look on the same vehicle.
Quick math: 275/40 R19 is 25.4 mm taller than 275/40 R18, shifting the speedometer by +3.75%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
+25.4 mm
3.75%
Speedometer at 100
103.8 km/h
+3.75% error
Ground clearance
+12.7 mm
ride height delta
Sidewall change
0.0 mm
revs/km: 453.0
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/compare/275-40-r18-vs-275-40-r19Detailed comparison
| Metric | 275/40 R18 | 275/40 R19 | Difference |
|---|---|---|---|
| Overall diameter | 677.2 mm | 702.6 mm | +25.4 mm (+3.75%) |
| Sidewall height | 110.0 mm | 110.0 mm | 0.0 mm |
| Circumference | 2.127 m | 2.207 m | +79.8 mm |
| Revs / km | 470.0 | 453.0 | -17.0 |
| Ground clearance | reference | +12.7 mm | +12.7 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 103.8 km/h | +3.75 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 103.8 km/h after switching to 275/40 R19 — a +3.75% 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 +12.7 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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275/40 R18
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275/40 R19
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