Comparison
265/35 R22 vs 265/40 R20
Going from 265/35 R22 to 265/40 R20 is a minus-2 setup that adds sidewall on a smaller 20-inch wheel. This alternative fitment moves rolling diameter well outside the usual OEM tolerance. Extra sidewall absorbs impacts more readily — a sensible bias for daily commuting and broken pavement.
Indicated speed will drift far enough that recalibration is worth considering. The 3–5% diameter gap puts this in caution territory: doable on many cars, but verify clearance and consider recalibration.
TakeTypical choice for a dedicated winter or off-road setup where extra sidewall pays off.
Quick math: 265/40 R20 is 24.3 mm shorter than 265/35 R22, shifting the speedometer by -3.26%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
-24.3 mm
-3.26%
Speedometer at 100
96.7 km/h
-3.26% error
Ground clearance
-12.1 mm
ride height delta
Sidewall change
+13.3 mm
revs/km: 442.1
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/compare/265-35-r22-vs-265-40-r20Detailed comparison
| Metric | 265/35 R22 | 265/40 R20 | Difference |
|---|---|---|---|
| Overall diameter | 744.3 mm | 720.0 mm | -24.3 mm (-3.26%) |
| Sidewall height | 92.8 mm | 106.0 mm | +13.3 mm |
| Circumference | 2.338 m | 2.262 m | -76.3 mm |
| Revs / km | 427.7 | 442.1 | +14.4 |
| Ground clearance | reference | -12.1 mm | -12.1 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 96.7 km/h | -3.26 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 96.7 km/h after switching to 265/40 R20 — a -3.26% 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 -12.1 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 R22
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265/40 R20
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