Comparison
235/60 R16 vs 265/40 R18
265/40 R18 is a plus-2 alternative to 235/60 R16 — the bigger wheel shows through a thinner sidewall. This swap trims or stretches rolling diameter by a small margin.
Expect a slight but noticeable shift in indicated speed compared to the original tires. Expect a more planted steering feel, at the cost of some of the cushioning a taller sidewall provides. More tread on the ground tends to improve dry grip and stance, with a small fuel-economy and clearance tradeoff. Visually, the bigger wheel fills the arch and gives the car a more aggressive stance. 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: 265/40 R18 is 19.2 mm shorter than 235/60 R16, shifting the speedometer by -2.79%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-19.2 mm
-2.79%
Speedometer at 100
97.2 km/h
-2.79% error
Ground clearance
-9.6 mm
ride height delta
Sidewall change
-35.0 mm
revs/km: 475.7
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/compare/235-60-r16-vs-265-40-r18Detailed comparison
| Metric | 235/60 R16 | 265/40 R18 | Difference |
|---|---|---|---|
| Overall diameter | 688.4 mm | 669.2 mm | -19.2 mm (-2.79%) |
| Sidewall height | 141.0 mm | 106.0 mm | -35.0 mm |
| Circumference | 2.163 m | 2.102 m | -60.3 mm |
| Revs / km | 462.4 | 475.7 | +13.3 |
| Ground clearance | reference | -9.6 mm | -9.6 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 97.2 km/h | -2.79 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 97.2 km/h after switching to 265/40 R18 — a -2.79% 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
235/60 R16
Back to
265/40 R18
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