Comparison
235/55 R18 vs 245/45 R19
Plus-sizing from 235/55 R18 to 245/45 R19 keeps overall diameter close to factory while opening room for a larger 19-inch wheel. This tire combination shifts overall diameter slightly from OEM.
The speedometer offset is small but measurable; worth keeping in mind if you watch the dash closely. Less sidewall flex usually translates to crisper turn-in and a slightly stiffer ride over rough pavement. More tread on the ground tends to improve dry grip and stance, with a small fuel-economy and clearance tradeoff. Many drivers pick this direction primarily for appearance — the bigger rim simply looks more aggressive. Overall the swap sits inside the safe ±3% diameter window, so ABS, traction control and gearing behave normally.
TakeA solid pick for drivers chasing a more aggressive stance without abandoning OEM rolling diameter.
Quick math: 245/45 R19 is 12.6 mm shorter than 235/55 R18, shifting the speedometer by -1.76%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-12.6 mm
-1.76%
Speedometer at 100
98.2 km/h
-1.76% error
Ground clearance
-6.3 mm
ride height delta
Sidewall change
-19.0 mm
revs/km: 452.7
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/compare/235-55-r18-vs-245-45-r19Detailed comparison
| Metric | 235/55 R18 | 245/45 R19 | Difference |
|---|---|---|---|
| Overall diameter | 715.7 mm | 703.1 mm | -12.6 mm (-1.76%) |
| Sidewall height | 129.3 mm | 110.3 mm | -19.0 mm |
| Circumference | 2.248 m | 2.209 m | -39.6 mm |
| Revs / km | 444.8 | 452.7 | +8.0 |
| Ground clearance | reference | -6.3 mm | -6.3 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 98.2 km/h | -1.76 km/h |
Verdict: excellent
Within ±3% — speedometer, ABS and traction control should behave normally.
Speedometer impact
At a true 100 km/h, your dashboard will read 98.2 km/h after switching to 245/45 R19 — a -1.76% 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 -6.3 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
235/55 R18
Back to
245/45 R19
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