Comparison
225/35 R19 vs 225/45 R18
225/45 R18 drops the rim from 19 to 18 inches versus 225/35 R19, trading wheel size for taller sidewall. This sizing approach moves rolling diameter well outside the usual OEM tolerance. Extra sidewall absorbs impacts more readily — a sensible bias for daily commuting and broken pavement.
Indicated speed will drift far enough that recalibration is worth considering. 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: 225/45 R18 is 19.6 mm taller than 225/35 R19, shifting the speedometer by +3.06%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
+19.6 mm
3.06%
Speedometer at 100
103.1 km/h
+3.06% error
Ground clearance
+9.8 mm
ride height delta
Sidewall change
+22.5 mm
revs/km: 482.5
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/compare/225-35-r19-vs-225-45-r18Detailed comparison
| Metric | 225/35 R19 | 225/45 R18 | Difference |
|---|---|---|---|
| Overall diameter | 640.1 mm | 659.7 mm | +19.6 mm (+3.06%) |
| Sidewall height | 78.8 mm | 101.3 mm | +22.5 mm |
| Circumference | 2.011 m | 2.073 m | +61.6 mm |
| Revs / km | 497.3 | 482.5 | -14.8 |
| Ground clearance | reference | +9.8 mm | +9.8 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 103.1 km/h | +3.06 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 103.1 km/h after switching to 225/45 R18 — a +3.06% 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 +9.8 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.
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225/35 R19
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225/45 R18
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