Comparison
205/60 R16 vs 215/40 R18
Plus-sizing from 205/60 R16 to 215/40 R18 keeps overall diameter close to factory while opening room for a larger 18-inch wheel. This swap noticeably changes overall diameter compared to OEM. Indicated speed will drift far enough that recalibration is worth considering. The shorter sidewall gives the tire a firmer, more responsive feel and sharpens steering input. 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: 215/40 R18 is 23.2 mm shorter than 205/60 R16, shifting the speedometer by -3.56%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
-23.2 mm
-3.56%
Speedometer at 100
96.4 km/h
-3.56% error
Ground clearance
-11.6 mm
ride height delta
Sidewall change
-37.0 mm
revs/km: 505.9
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/compare/205-60-r16-vs-215-40-r18Detailed comparison
| Metric | 205/60 R16 | 215/40 R18 | Difference |
|---|---|---|---|
| Overall diameter | 652.4 mm | 629.2 mm | -23.2 mm (-3.56%) |
| Sidewall height | 123.0 mm | 86.0 mm | -37.0 mm |
| Circumference | 2.050 m | 1.977 m | -72.9 mm |
| Revs / km | 487.9 | 505.9 | +18.0 |
| Ground clearance | reference | -11.6 mm | -11.6 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 96.4 km/h | -3.56 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 96.4 km/h after switching to 215/40 R18 — a -3.56% 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 -11.6 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.
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205/60 R16
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215/40 R18
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