Comparison
225/45 R19 vs 285/35 R20
285/35 R20 is a plus-1 alternative to 225/45 R19 — the bigger wheel shows through a thinner sidewall. This sizing approach 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. Less sidewall flex usually translates to crisper turn-in and a slightly stiffer ride over rough pavement. 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: 285/35 R20 is 22.4 mm taller than 225/45 R19, shifting the speedometer by +3.27%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
+22.4 mm
3.27%
Speedometer at 100
103.3 km/h
+3.27% error
Ground clearance
+11.2 mm
ride height delta
Sidewall change
-1.5 mm
revs/km: 449.9
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/compare/225-45-r19-vs-285-35-r20Detailed comparison
| Metric | 225/45 R19 | 285/35 R20 | Difference |
|---|---|---|---|
| Overall diameter | 685.1 mm | 707.5 mm | +22.4 mm (+3.27%) |
| Sidewall height | 101.3 mm | 99.8 mm | -1.5 mm |
| Circumference | 2.152 m | 2.223 m | +70.4 mm |
| Revs / km | 464.6 | 449.9 | -14.7 |
| Ground clearance | reference | +11.2 mm | +11.2 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 103.3 km/h | +3.27 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 103.3 km/h after switching to 285/35 R20 — a +3.27% 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 +11.2 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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225/45 R19
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285/35 R20
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