Comparison
235/60 R18 vs 245/45 R19
245/45 R19 is a plus-1 alternative to 235/60 R18 — the bigger wheel shows through a thinner sidewall. This tire combination moves rolling diameter well outside the usual OEM tolerance. The speedometer error is noticeable and may warrant a recalibration if you rely on indicated speed. Expect a more planted steering feel, at the cost of some of the cushioning a taller sidewall provides. The 3–5% diameter gap puts this in caution territory: doable on many cars, but verify clearance and consider recalibration.
TakeA solid pick for drivers chasing a more aggressive stance without abandoning OEM rolling diameter.
Quick math: 245/45 R19 is 36.1 mm shorter than 235/60 R18, shifting the speedometer by -4.88%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
-36.1 mm
-4.88%
Speedometer at 100
95.1 km/h
-4.88% error
Ground clearance
-18.1 mm
ride height delta
Sidewall change
-30.8 mm
revs/km: 452.7
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/compare/235-60-r18-vs-245-45-r19Detailed comparison
| Metric | 235/60 R18 | 245/45 R19 | Difference |
|---|---|---|---|
| Overall diameter | 739.2 mm | 703.1 mm | -36.1 mm (-4.88%) |
| Sidewall height | 141.0 mm | 110.3 mm | -30.8 mm |
| Circumference | 2.322 m | 2.209 m | -113.4 mm |
| Revs / km | 430.6 | 452.7 | +22.1 |
| Ground clearance | reference | -18.1 mm | -18.1 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 95.1 km/h | -4.88 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 95.1 km/h after switching to 245/45 R19 — a -4.88% 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 -18.1 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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235/60 R18
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245/45 R19
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