Comparison
245/35 R20 vs 255/45 R19
Going from 245/35 R20 to 255/45 R19 is a minus-1 setup that adds sidewall on a smaller 19-inch wheel. This wheel and tire pairing noticeably changes overall diameter compared to OEM.
The speedometer error is noticeable and may warrant a recalibration if you rely on indicated speed. Extra sidewall absorbs impacts more readily — a sensible bias for daily commuting and broken pavement. Extra width broadens the footprint for more grip, but check inner liner and strut clearance before fitting. The smaller wheel is also lighter and easier to find affordable winter rubber for. Diameter delta falls in the cautious 3–5% range, where speedometer recalibration and a careful clearance check are worth doing.
TakeTypical choice for a dedicated winter or off-road setup where extra sidewall pays off.
Quick math: 255/45 R19 is 32.6 mm taller than 245/35 R20, shifting the speedometer by +4.80%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
+32.6 mm
4.80%
Speedometer at 100
104.8 km/h
+4.80% error
Ground clearance
+16.3 mm
ride height delta
Sidewall change
+29.0 mm
revs/km: 447.0
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/compare/245-35-r20-vs-255-45-r19Detailed comparison
| Metric | 245/35 R20 | 255/45 R19 | Difference |
|---|---|---|---|
| Overall diameter | 679.5 mm | 712.1 mm | +32.6 mm (+4.80%) |
| Sidewall height | 85.8 mm | 114.8 mm | +29.0 mm |
| Circumference | 2.135 m | 2.237 m | +102.4 mm |
| Revs / km | 468.4 | 447.0 | -21.4 |
| Ground clearance | reference | +16.3 mm | +16.3 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 104.8 km/h | +4.80 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 104.8 km/h after switching to 255/45 R19 — a +4.80% 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 +16.3 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
245/35 R20
Back to
255/45 R19
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