Comparison
225/60 R17 vs 265/40 R18
Plus-sizing from 225/60 R17 to 265/40 R18 keeps overall diameter close to factory while opening room for a larger 18-inch wheel. This tire combination swings rolling diameter far enough to feel on the road. Expect a more planted steering feel, at the cost of some of the cushioning a taller sidewall provides.
The speedometer error is noticeable and may warrant a recalibration if you rely on indicated speed. 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: 265/40 R18 is 32.6 mm shorter than 225/60 R17, shifting the speedometer by -4.65%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
-32.6 mm
-4.65%
Speedometer at 100
95.4 km/h
-4.65% error
Ground clearance
-16.3 mm
ride height delta
Sidewall change
-29.0 mm
revs/km: 475.7
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/compare/225-60-r17-vs-265-40-r18Detailed comparison
| Metric | 225/60 R17 | 265/40 R18 | Difference |
|---|---|---|---|
| Overall diameter | 701.8 mm | 669.2 mm | -32.6 mm (-4.65%) |
| Sidewall height | 135.0 mm | 106.0 mm | -29.0 mm |
| Circumference | 2.205 m | 2.102 m | -102.4 mm |
| Revs / km | 453.6 | 475.7 | +22.1 |
| Ground clearance | reference | -16.3 mm | -16.3 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 95.4 km/h | -4.65 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 95.4 km/h after switching to 265/40 R18 — a -4.65% 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 -16.3 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.
Back to
225/60 R17
Back to
265/40 R18
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