Comparison
295/30 R22 vs 295/40 R20
Going from 295/30 R22 to 295/40 R20 is a minus-2 setup that adds sidewall on a smaller 20-inch wheel. This setup lands within OEM rolling-diameter tolerance. Extra sidewall absorbs impacts more readily — a sensible bias for daily commuting and broken pavement.
The speedometer offset is mild and well inside what most cars can tolerate without recalibration. Diameter change stays inside the conservative ±3% safety window — an OEM-safe fitment on most vehicles.
TakeTypical choice for a dedicated winter or off-road setup where extra sidewall pays off.
Quick math: 295/40 R20 is 8.2 mm taller than 295/30 R22, shifting the speedometer by +1.11%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
+8.2 mm
1.11%
Speedometer at 100
101.1 km/h
+1.11% error
Ground clearance
+4.1 mm
ride height delta
Sidewall change
+29.5 mm
revs/km: 427.8
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/compare/295-30-r22-vs-295-40-r20Detailed comparison
| Metric | 295/30 R22 | 295/40 R20 | Difference |
|---|---|---|---|
| Overall diameter | 735.8 mm | 744.0 mm | +8.2 mm (+1.11%) |
| Sidewall height | 88.5 mm | 118.0 mm | +29.5 mm |
| Circumference | 2.312 m | 2.337 m | +25.8 mm |
| Revs / km | 432.6 | 427.8 | -4.8 |
| Ground clearance | reference | +4.1 mm | +4.1 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 101.1 km/h | +1.11 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 101.1 km/h after switching to 295/40 R20 — a +1.11% 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 +4.1 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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295/30 R22
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295/40 R20
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