Comparison
275/40 R20 vs 295/40 R20
Stepping from 275/40 R20 to 295/40 R20 keeps the 20-inch wheel but widens the section by 20 mm. This sizing approach trims or stretches rolling diameter by a small margin. Extra width broadens the footprint for more grip, but check inner liner and strut clearance before fitting.
Expect a slight but noticeable shift in indicated speed compared to the original tires. Overall the swap sits inside the safe ±3% diameter window, so ABS, traction control and gearing behave normally.
TakeUseful when extra dry grip and stance matter more than a small fuel-economy hit.
Quick math: 295/40 R20 is 16.0 mm taller than 275/40 R20, shifting the speedometer by +2.20%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
+16.0 mm
2.20%
Speedometer at 100
102.2 km/h
+2.20% error
Ground clearance
+8.0 mm
ride height delta
Sidewall change
+8.0 mm
revs/km: 427.8
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/compare/275-40-r20-vs-295-40-r20Detailed comparison
| Metric | 275/40 R20 | 295/40 R20 | Difference |
|---|---|---|---|
| Overall diameter | 728.0 mm | 744.0 mm | +16.0 mm (+2.20%) |
| Sidewall height | 110.0 mm | 118.0 mm | +8.0 mm |
| Circumference | 2.287 m | 2.337 m | +50.3 mm |
| Revs / km | 437.2 | 427.8 | -9.4 |
| Ground clearance | reference | +8.0 mm | +8.0 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 102.2 km/h | +2.20 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 102.2 km/h after switching to 295/40 R20 — a +2.20% 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 +8.0 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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275/40 R20
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295/40 R20
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