Comparison
235/60 R16 vs 275/40 R18
Switching from 235/60 R16 to 275/40 R18 is a plus-2 upgrade that wraps a shorter sidewall around a larger 18-inch wheel. This swap shifts overall diameter slightly from OEM. Expect a slight but noticeable shift in indicated speed compared to the original tires. The shorter sidewall gives the tire a firmer, more responsive feel and sharpens steering input. Diameter change stays inside the conservative ±3% safety window — an OEM-safe fitment on most vehicles.
TakeCommon upgrade for sportier handling and a tighter wheel-gap look on the same vehicle.
Quick math: 275/40 R18 is 11.2 mm shorter than 235/60 R16, shifting the speedometer by -1.63%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-11.2 mm
-1.63%
Speedometer at 100
98.4 km/h
-1.63% error
Ground clearance
-5.6 mm
ride height delta
Sidewall change
-31.0 mm
revs/km: 470.0
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/compare/235-60-r16-vs-275-40-r18Detailed comparison
| Metric | 235/60 R16 | 275/40 R18 | Difference |
|---|---|---|---|
| Overall diameter | 688.4 mm | 677.2 mm | -11.2 mm (-1.63%) |
| Sidewall height | 141.0 mm | 110.0 mm | -31.0 mm |
| Circumference | 2.163 m | 2.127 m | -35.2 mm |
| Revs / km | 462.4 | 470.0 | +7.6 |
| Ground clearance | reference | -5.6 mm | -5.6 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 98.4 km/h | -1.63 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 98.4 km/h after switching to 275/40 R18 — a -1.63% 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 -5.6 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
235/60 R16
Back to
275/40 R18
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