Comparison
255/40 R19 vs 295/35 R20
Plus-sizing from 255/40 R19 to 295/35 R20 keeps overall diameter close to factory while opening room for a larger 20-inch wheel. This tire combination swings rolling diameter far enough to feel on the road. 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 3–5% diameter gap puts this in caution territory: doable on many cars, but verify clearance and consider recalibration.
TakeCommon upgrade for sportier handling and a tighter wheel-gap look on the same vehicle.
Quick math: 295/35 R20 is 27.9 mm taller than 255/40 R19, shifting the speedometer by +4.06%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
+27.9 mm
4.06%
Speedometer at 100
104.1 km/h
+4.06% error
Ground clearance
+14.0 mm
ride height delta
Sidewall change
+1.3 mm
revs/km: 445.5
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/compare/255-40-r19-vs-295-35-r20Detailed comparison
| Metric | 255/40 R19 | 295/35 R20 | Difference |
|---|---|---|---|
| Overall diameter | 686.6 mm | 714.5 mm | +27.9 mm (+4.06%) |
| Sidewall height | 102.0 mm | 103.3 mm | +1.3 mm |
| Circumference | 2.157 m | 2.245 m | +87.7 mm |
| Revs / km | 463.6 | 445.5 | -18.1 |
| Ground clearance | reference | +14.0 mm | +14.0 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 104.1 km/h | +4.06 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 104.1 km/h after switching to 295/35 R20 — a +4.06% 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 +14.0 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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255/40 R19
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295/35 R20
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