Comparison
205/60 R16 vs 265/40 R18
Going from 205/60 R16 to 265/40 R18 steps up to a 18-inch rim while trimming sidewall to stay near OEM rolling diameter. This alternative fitment shifts overall diameter slightly from OEM. Less sidewall flex usually translates to crisper turn-in and a slightly stiffer ride over rough pavement.
The speedometer offset is small but measurable; worth keeping in mind if you watch the dash closely. Diameter change stays inside the conservative ±3% safety window — an OEM-safe fitment on most vehicles.
TakeA solid pick for drivers chasing a more aggressive stance without abandoning OEM rolling diameter.
Quick math: 265/40 R18 is 16.8 mm taller than 205/60 R16, shifting the speedometer by +2.58%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
+16.8 mm
2.58%
Speedometer at 100
102.6 km/h
+2.58% error
Ground clearance
+8.4 mm
ride height delta
Sidewall change
-17.0 mm
revs/km: 475.7
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/compare/205-60-r16-vs-265-40-r18Detailed comparison
| Metric | 205/60 R16 | 265/40 R18 | Difference |
|---|---|---|---|
| Overall diameter | 652.4 mm | 669.2 mm | +16.8 mm (+2.58%) |
| Sidewall height | 123.0 mm | 106.0 mm | -17.0 mm |
| Circumference | 2.050 m | 2.102 m | +52.8 mm |
| Revs / km | 487.9 | 475.7 | -12.2 |
| Ground clearance | reference | +8.4 mm | +8.4 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 102.6 km/h | +2.58 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 102.6 km/h after switching to 265/40 R18 — a +2.58% 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 +8.4 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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265/40 R18
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