Comparison
235/35 R19 vs 245/35 R18
Minus-sizing from 235/35 R19 to 245/35 R18 pairs a smaller 18-inch wheel with more rubber between the rim and road. This wheel and tire pairing trims or stretches rolling diameter by a small margin.
Expect a slight but noticeable shift in indicated speed compared to the original tires. More tread on the ground tends to improve dry grip and stance, with a small fuel-economy and clearance tradeoff. Minus-sizing keeps replacement costs down and opens up a wider range of winter and all-terrain tires. Overall the swap sits inside the safe ±3% diameter window, so ABS, traction control and gearing behave normally.
TakeTypical choice for a dedicated winter or off-road setup where extra sidewall pays off.
Quick math: 245/35 R18 is 18.4 mm shorter than 235/35 R19, shifting the speedometer by -2.84%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-18.4 mm
-2.84%
Speedometer at 100
97.2 km/h
-2.84% error
Ground clearance
-9.2 mm
ride height delta
Sidewall change
+3.5 mm
revs/km: 506.3
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/compare/235-35-r19-vs-245-35-r18Detailed comparison
| Metric | 235/35 R19 | 245/35 R18 | Difference |
|---|---|---|---|
| Overall diameter | 647.1 mm | 628.7 mm | -18.4 mm (-2.84%) |
| Sidewall height | 82.3 mm | 85.8 mm | +3.5 mm |
| Circumference | 2.033 m | 1.975 m | -57.8 mm |
| Revs / km | 491.9 | 506.3 | +14.4 |
| Ground clearance | reference | -9.2 mm | -9.2 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 97.2 km/h | -2.84 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 97.2 km/h after switching to 245/35 R18 — a -2.84% 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 -9.2 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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235/35 R19
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245/35 R18
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