Comparison
265/40 R21 vs 295/35 R20
295/35 R20 drops the rim from 21 to 20 inches versus 265/40 R21, trading wheel size for taller sidewall. This swap noticeably changes overall diameter compared to OEM.
The speedometer error is noticeable and may warrant a recalibration if you rely on indicated speed. Expect a more planted steering feel, at the cost of some of the cushioning a taller sidewall provides. The wider section adds contact patch and lateral stability, while eating into fender and suspension clearance. The smaller wheel is also lighter and easier to find affordable winter rubber for. 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: 295/35 R20 is 30.9 mm shorter than 265/40 R21, shifting the speedometer by -4.15%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
-30.9 mm
-4.15%
Speedometer at 100
95.9 km/h
-4.15% error
Ground clearance
-15.4 mm
ride height delta
Sidewall change
-2.8 mm
revs/km: 445.5
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/compare/265-40-r21-vs-295-35-r20Detailed comparison
| Metric | 265/40 R21 | 295/35 R20 | Difference |
|---|---|---|---|
| Overall diameter | 745.4 mm | 714.5 mm | -30.9 mm (-4.15%) |
| Sidewall height | 106.0 mm | 103.3 mm | -2.8 mm |
| Circumference | 2.342 m | 2.245 m | -97.1 mm |
| Revs / km | 427.0 | 445.5 | +18.5 |
| Ground clearance | reference | -15.4 mm | -15.4 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 95.9 km/h | -4.15 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 95.9 km/h after switching to 295/35 R20 — a -4.15% 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 -15.4 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.
Back to
265/40 R21
Back to
295/35 R20
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