Comparison
225/40 R19 vs 265/40 R18
265/40 R18 drops the rim from 19 to 18 inches versus 225/40 R19, trading wheel size for taller sidewall. This wheel and tire pairing preserves rolling diameter within a hair of the original. Dashboard speed shifts only marginally — within the noise of normal OEM tolerance. The wider section adds contact patch and lateral stability, while eating into fender and suspension clearance. Diameter change stays inside the conservative ±3% safety window — an OEM-safe fitment on most vehicles.
TakeTypical choice for a dedicated winter or off-road setup where extra sidewall pays off.
Quick math: 265/40 R18 is 6.6 mm taller than 225/40 R19, shifting the speedometer by +1.00%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
+6.6 mm
1.00%
Speedometer at 100
101.0 km/h
+1.00% error
Ground clearance
+3.3 mm
ride height delta
Sidewall change
+16.0 mm
revs/km: 475.7
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/compare/225-40-r19-vs-265-40-r18Detailed comparison
| Metric | 225/40 R19 | 265/40 R18 | Difference |
|---|---|---|---|
| Overall diameter | 662.6 mm | 669.2 mm | +6.6 mm (+1.00%) |
| Sidewall height | 90.0 mm | 106.0 mm | +16.0 mm |
| Circumference | 2.082 m | 2.102 m | +20.7 mm |
| Revs / km | 480.4 | 475.7 | -4.7 |
| Ground clearance | reference | +3.3 mm | +3.3 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 101.0 km/h | +1.00 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 101.0 km/h after switching to 265/40 R18 — a +1.00% 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 +3.3 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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225/40 R19
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265/40 R18
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