Comparison
245/35 R20 vs 245/45 R19
Going from 245/35 R20 to 245/45 R19 is a minus-1 setup that adds sidewall on a smaller 19-inch wheel. This sizing approach noticeably changes overall diameter compared to OEM. The taller sidewall adds cushioning over potholes and rougher roads, with a softer overall ride.
The speedometer error is noticeable and may warrant a recalibration if you rely on indicated speed. The 3–5% diameter gap puts this in caution territory: doable on many cars, but verify clearance and consider recalibration.
TakeTypical choice for a dedicated winter or off-road setup where extra sidewall pays off.
Quick math: 245/45 R19 is 23.6 mm taller than 245/35 R20, shifting the speedometer by +3.47%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
+23.6 mm
3.47%
Speedometer at 100
103.5 km/h
+3.47% error
Ground clearance
+11.8 mm
ride height delta
Sidewall change
+24.5 mm
revs/km: 452.7
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/compare/245-35-r20-vs-245-45-r19Detailed comparison
| Metric | 245/35 R20 | 245/45 R19 | Difference |
|---|---|---|---|
| Overall diameter | 679.5 mm | 703.1 mm | +23.6 mm (+3.47%) |
| Sidewall height | 85.8 mm | 110.3 mm | +24.5 mm |
| Circumference | 2.135 m | 2.209 m | +74.1 mm |
| Revs / km | 468.4 | 452.7 | -15.7 |
| Ground clearance | reference | +11.8 mm | +11.8 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 103.5 km/h | +3.47 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 103.5 km/h after switching to 245/45 R19 — a +3.47% 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 +11.8 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
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245/45 R19
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