Comparison
265/35 R19 vs 275/40 R18
Minus-sizing from 265/35 R19 to 275/40 R18 pairs a smaller 18-inch wheel with more rubber between the rim and road. This sizing approach preserves rolling diameter within a hair of the original. Extra sidewall absorbs impacts more readily — a sensible bias for daily commuting and broken pavement.
Speedometer drift stays small enough that most drivers won't notice it day to day. Overall the swap sits inside the safe ±3% diameter window, so ABS, traction control and gearing behave normally.
TakePractical direction for winter wheels, chains, or rougher pavement where cushioning matters.
Quick math: 275/40 R18 is 9.1 mm taller than 265/35 R19, shifting the speedometer by +1.36%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
+9.1 mm
1.36%
Speedometer at 100
101.4 km/h
+1.36% error
Ground clearance
+4.6 mm
ride height delta
Sidewall change
+17.3 mm
revs/km: 470.0
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/compare/265-35-r19-vs-275-40-r18Detailed comparison
| Metric | 265/35 R19 | 275/40 R18 | Difference |
|---|---|---|---|
| Overall diameter | 668.1 mm | 677.2 mm | +9.1 mm (+1.36%) |
| Sidewall height | 92.8 mm | 110.0 mm | +17.3 mm |
| Circumference | 2.099 m | 2.127 m | +28.6 mm |
| Revs / km | 476.4 | 470.0 | -6.4 |
| Ground clearance | reference | +4.6 mm | +4.6 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 101.4 km/h | +1.36 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 101.4 km/h after switching to 275/40 R18 — a +1.36% 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 +4.6 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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265/35 R19
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275/40 R18
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