Comparison
265/35 R20 vs 265/40 R20
265/40 R20 is a taller-sidewall alternative to 265/35 R20 on the same 20-inch rim. This wheel and tire pairing moves rolling diameter well outside the usual OEM tolerance. The speedometer error is noticeable and may warrant a recalibration if you rely on indicated speed. Extra sidewall absorbs impacts more readily — a sensible bias for daily commuting and broken pavement. Diameter delta falls in the cautious 3–5% range, where speedometer recalibration and a careful clearance check are worth doing.
TakeA comfort-leaning direction that's easier on wheels and suspension over rough surfaces.
Quick math: 265/40 R20 is 26.5 mm taller than 265/35 R20, shifting the speedometer by +3.82%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
+26.5 mm
3.82%
Speedometer at 100
103.8 km/h
+3.82% error
Ground clearance
+13.3 mm
ride height delta
Sidewall change
+13.3 mm
revs/km: 442.1
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/compare/265-35-r20-vs-265-40-r20Detailed comparison
| Metric | 265/35 R20 | 265/40 R20 | Difference |
|---|---|---|---|
| Overall diameter | 693.5 mm | 720.0 mm | +26.5 mm (+3.82%) |
| Sidewall height | 92.8 mm | 106.0 mm | +13.3 mm |
| Circumference | 2.179 m | 2.262 m | +83.3 mm |
| Revs / km | 459.0 | 442.1 | -16.9 |
| Ground clearance | reference | +13.3 mm | +13.3 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 103.8 km/h | +3.82 km/h |
Verdict: warning
Between 3% and 5% — noticeable speedometer drift; recalibration may be advisable.
Speedometer impact
At a true 100 km/h, your dashboard will read 103.8 km/h after switching to 265/40 R20 — a +3.82% 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 +13.3 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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265/35 R20
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265/40 R20
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