Comparison
235/45 R18 vs 245/35 R19
Plus-sizing from 235/45 R18 to 245/35 R19 keeps overall diameter close to factory while opening room for a larger 19-inch wheel. This swap trims or stretches rolling diameter by a small margin.
Expect a slight but noticeable shift in indicated speed compared to the original tires. Expect a more planted steering feel, at the cost of some of the cushioning a taller sidewall provides. More tread on the ground tends to improve dry grip and stance, with a small fuel-economy and clearance tradeoff. Visually, the bigger wheel fills the arch and gives the car a more aggressive stance. 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: 245/35 R19 is 14.6 mm shorter than 235/45 R18, shifting the speedometer by -2.18%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-14.6 mm
-2.18%
Speedometer at 100
97.8 km/h
-2.18% error
Ground clearance
-7.3 mm
ride height delta
Sidewall change
-20.0 mm
revs/km: 486.6
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/compare/235-45-r18-vs-245-35-r19Detailed comparison
| Metric | 235/45 R18 | 245/35 R19 | Difference |
|---|---|---|---|
| Overall diameter | 668.7 mm | 654.1 mm | -14.6 mm (-2.18%) |
| Sidewall height | 105.8 mm | 85.8 mm | -20.0 mm |
| Circumference | 2.101 m | 2.055 m | -45.9 mm |
| Revs / km | 476.0 | 486.6 | +10.6 |
| Ground clearance | reference | -7.3 mm | -7.3 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 97.8 km/h | -2.18 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 97.8 km/h after switching to 245/35 R19 — a -2.18% 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 -7.3 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
235/45 R18
Back to
245/35 R19
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