Comparison
225/35 R19 vs 265/40 R18
265/40 R18 drops the rim from 19 to 18 inches versus 225/35 R19, trading wheel size for taller sidewall. This sizing approach swings rolling diameter far enough to feel on the road.
The speedometer error is noticeable and may warrant a recalibration if you rely on indicated speed. The taller sidewall adds cushioning over potholes and rougher roads, with a softer overall ride. Extra width broadens the footprint for more grip, but check inner liner and strut clearance before fitting. Minus-sizing keeps replacement costs down and opens up a wider range of winter and all-terrain tires. Diameter delta falls in the cautious 3–5% range, where speedometer recalibration and a careful clearance check are worth doing.
TakePractical direction for winter wheels, chains, or rougher pavement where cushioning matters.
Quick math: 265/40 R18 is 29.1 mm taller than 225/35 R19, shifting the speedometer by +4.55%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
+29.1 mm
4.55%
Speedometer at 100
104.5 km/h
+4.55% error
Ground clearance
+14.6 mm
ride height delta
Sidewall change
+27.3 mm
revs/km: 475.7
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/compare/225-35-r19-vs-265-40-r18Detailed comparison
| Metric | 225/35 R19 | 265/40 R18 | Difference |
|---|---|---|---|
| Overall diameter | 640.1 mm | 669.2 mm | +29.1 mm (+4.55%) |
| Sidewall height | 78.8 mm | 106.0 mm | +27.3 mm |
| Circumference | 2.011 m | 2.102 m | +91.4 mm |
| Revs / km | 497.3 | 475.7 | -21.6 |
| Ground clearance | reference | +14.6 mm | +14.6 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 104.5 km/h | +4.55 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 104.5 km/h after switching to 265/40 R18 — a +4.55% 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 +14.6 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.
Back to
225/35 R19
Back to
265/40 R18
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