Comparison
215/60 R16 vs 235/40 R18
Plus-sizing from 215/60 R16 to 235/40 R18 keeps overall diameter close to factory while opening room for a larger 18-inch wheel. This wheel and tire pairing moves rolling diameter a touch off the original spec. The shorter sidewall gives the tire a firmer, more responsive feel and sharpens steering input.
Expect a slight but noticeable shift in indicated speed compared to the original tires. Overall the swap sits inside the safe ±3% diameter window, so ABS, traction control and gearing behave normally.
TakeA solid pick for drivers chasing a more aggressive stance without abandoning OEM rolling diameter.
Quick math: 235/40 R18 is 19.2 mm shorter than 215/60 R16, shifting the speedometer by -2.89%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-19.2 mm
-2.89%
Speedometer at 100
97.1 km/h
-2.89% error
Ground clearance
-9.6 mm
ride height delta
Sidewall change
-35.0 mm
revs/km: 493.4
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/compare/215-60-r16-vs-235-40-r18Detailed comparison
| Metric | 215/60 R16 | 235/40 R18 | Difference |
|---|---|---|---|
| Overall diameter | 664.4 mm | 645.2 mm | -19.2 mm (-2.89%) |
| Sidewall height | 129.0 mm | 94.0 mm | -35.0 mm |
| Circumference | 2.087 m | 2.027 m | -60.3 mm |
| Revs / km | 479.1 | 493.4 | +14.3 |
| Ground clearance | reference | -9.6 mm | -9.6 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 97.1 km/h | -2.89 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 97.1 km/h after switching to 235/40 R18 — a -2.89% 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 -9.6 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
Back to
235/40 R18
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