Comparison
215/60 R17 vs 265/40 R18
265/40 R18 is a plus-1 alternative to 215/60 R17 — the bigger wheel shows through a thinner sidewall. This alternative fitment 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.
TakeA solid pick for drivers chasing a more aggressive stance without abandoning OEM rolling diameter.
Quick math: 265/40 R18 is 20.6 mm shorter than 215/60 R17, shifting the speedometer by -2.99%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-20.6 mm
-2.99%
Speedometer at 100
97.0 km/h
-2.99% error
Ground clearance
-10.3 mm
ride height delta
Sidewall change
-23.0 mm
revs/km: 475.7
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/compare/215-60-r17-vs-265-40-r18Detailed comparison
| Metric | 215/60 R17 | 265/40 R18 | Difference |
|---|---|---|---|
| Overall diameter | 689.8 mm | 669.2 mm | -20.6 mm (-2.99%) |
| Sidewall height | 129.0 mm | 106.0 mm | -23.0 mm |
| Circumference | 2.167 m | 2.102 m | -64.7 mm |
| Revs / km | 461.5 | 475.7 | +14.2 |
| Ground clearance | reference | -10.3 mm | -10.3 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 97.0 km/h | -2.99 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 97.0 km/h after switching to 265/40 R18 — a -2.99% 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 -10.3 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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215/60 R17
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265/40 R18
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