Comparison
265/40 R18 vs 275/35 R18
Stepping from 265/40 R18 to 275/35 R18 keeps the 18-inch wheel but widens the section by 10 mm. This alternative fitment trims or stretches rolling diameter by a small margin. 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. Diameter change stays inside the conservative ±3% safety window — an OEM-safe fitment on most vehicles.
TakeUseful when extra dry grip and stance matter more than a small fuel-economy hit.
Quick math: 275/35 R18 is 19.5 mm shorter than 265/40 R18, shifting the speedometer by -2.91%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-19.5 mm
-2.91%
Speedometer at 100
97.1 km/h
-2.91% error
Ground clearance
-9.8 mm
ride height delta
Sidewall change
-9.8 mm
revs/km: 489.9
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/compare/265-40-r18-vs-275-35-r18Detailed comparison
| Metric | 265/40 R18 | 275/35 R18 | Difference |
|---|---|---|---|
| Overall diameter | 669.2 mm | 649.7 mm | -19.5 mm (-2.91%) |
| Sidewall height | 106.0 mm | 96.3 mm | -9.8 mm |
| Circumference | 2.102 m | 2.041 m | -61.3 mm |
| Revs / km | 475.7 | 489.9 | +14.3 |
| Ground clearance | reference | -9.8 mm | -9.8 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 97.1 km/h | -2.91 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 275/35 R18 — a -2.91% 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 -9.8 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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265/40 R18
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275/35 R18
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