Comparison
215/60 R16 vs 225/40 R18
Going from 215/60 R16 to 225/40 R18 steps up to a 18-inch rim while trimming sidewall to stay near OEM rolling diameter. This alternative fitment swings rolling diameter far enough to feel on the road. Indicated speed will drift far enough that recalibration is worth considering. Expect a more planted steering feel, at the cost of some of the cushioning a taller sidewall provides. Diameter delta falls in the cautious 3–5% range, where speedometer recalibration and a careful clearance check are worth doing.
TakeA solid pick for drivers chasing a more aggressive stance without abandoning OEM rolling diameter.
Quick math: 225/40 R18 is 27.2 mm shorter than 215/60 R16, shifting the speedometer by -4.09%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
-27.2 mm
-4.09%
Speedometer at 100
95.9 km/h
-4.09% error
Ground clearance
-13.6 mm
ride height delta
Sidewall change
-39.0 mm
revs/km: 499.5
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/compare/215-60-r16-vs-225-40-r18Detailed comparison
| Metric | 215/60 R16 | 225/40 R18 | Difference |
|---|---|---|---|
| Overall diameter | 664.4 mm | 637.2 mm | -27.2 mm (-4.09%) |
| Sidewall height | 129.0 mm | 90.0 mm | -39.0 mm |
| Circumference | 2.087 m | 2.002 m | -85.5 mm |
| Revs / km | 479.1 | 499.5 | +20.5 |
| Ground clearance | reference | -13.6 mm | -13.6 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 95.9 km/h | -4.09 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 95.9 km/h after switching to 225/40 R18 — a -4.09% 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 -13.6 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
215/60 R16
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225/40 R18
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