Comparison
245/40 R18 vs 285/35 R19
285/35 R19 is a plus-1 alternative to 245/40 R18 — the bigger wheel shows through a thinner sidewall. This sizing approach swings rolling diameter far enough to feel on the road.
Indicated speed will drift far enough that recalibration is worth considering. Less sidewall flex usually translates to crisper turn-in and a slightly stiffer ride over rough pavement. Extra width broadens the footprint for more grip, but check inner liner and strut clearance before fitting. Many drivers pick this direction primarily for appearance — the bigger rim simply looks more aggressive. Diameter delta falls in the cautious 3–5% range, where speedometer recalibration and a careful clearance check are worth doing.
TakeCommon upgrade for sportier handling and a tighter wheel-gap look on the same vehicle.
Quick math: 285/35 R19 is 28.9 mm taller than 245/40 R18, shifting the speedometer by +4.42%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
+28.9 mm
4.42%
Speedometer at 100
104.4 km/h
+4.42% error
Ground clearance
+14.4 mm
ride height delta
Sidewall change
+1.8 mm
revs/km: 466.7
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/compare/245-40-r18-vs-285-35-r19Detailed comparison
| Metric | 245/40 R18 | 285/35 R19 | Difference |
|---|---|---|---|
| Overall diameter | 653.2 mm | 682.1 mm | +28.9 mm (+4.42%) |
| Sidewall height | 98.0 mm | 99.8 mm | +1.8 mm |
| Circumference | 2.052 m | 2.143 m | +90.8 mm |
| Revs / km | 487.3 | 466.7 | -20.6 |
| Ground clearance | reference | +14.4 mm | +14.4 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 104.4 km/h | +4.42 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 104.4 km/h after switching to 285/35 R19 — a +4.42% 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 +14.4 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
245/40 R18
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285/35 R19
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