Comparison
225/50 R18 vs 265/40 R18
265/40 R18 is a lower-profile take on 225/50 R18 — same 18-inch wheel, shorter sidewall. This sizing approach moves rolling diameter a touch off the original spec. Expect a slight but noticeable shift in indicated speed compared to the original tires. Expect a more planted steering feel, at the cost of some of the cushioning a taller sidewall provides. Diameter change stays inside the conservative ±3% safety window — an OEM-safe fitment on most vehicles.
TakeSuits drivers who value sharper steering and appearance over outright ride softness.
Quick math: 265/40 R18 is 13.0 mm shorter than 225/50 R18, shifting the speedometer by -1.91%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-13.0 mm
-1.91%
Speedometer at 100
98.1 km/h
-1.91% error
Ground clearance
-6.5 mm
ride height delta
Sidewall change
-6.5 mm
revs/km: 475.7
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/compare/225-50-r18-vs-265-40-r18Detailed comparison
| Metric | 225/50 R18 | 265/40 R18 | Difference |
|---|---|---|---|
| Overall diameter | 682.2 mm | 669.2 mm | -13.0 mm (-1.91%) |
| Sidewall height | 112.5 mm | 106.0 mm | -6.5 mm |
| Circumference | 2.143 m | 2.102 m | -40.8 mm |
| Revs / km | 466.6 | 475.7 | +9.1 |
| Ground clearance | reference | -6.5 mm | -6.5 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 98.1 km/h | -1.91 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 98.1 km/h after switching to 265/40 R18 — a -1.91% 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 -6.5 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
225/50 R18
Back to
265/40 R18
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