Comparison
235/35 R19 vs 255/35 R18
255/35 R18 drops the rim from 19 to 18 inches versus 235/35 R19, trading wheel size for taller sidewall. This sizing approach moves rolling diameter a touch off the original spec.
The speedometer offset is small but measurable; worth keeping in mind if you watch the dash closely. The wider section adds contact patch and lateral stability, while eating into fender and suspension clearance. 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.
TakePractical direction for winter wheels, chains, or rougher pavement where cushioning matters.
Quick math: 255/35 R18 is 11.4 mm shorter than 235/35 R19, shifting the speedometer by -1.76%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-11.4 mm
-1.76%
Speedometer at 100
98.2 km/h
-1.76% error
Ground clearance
-5.7 mm
ride height delta
Sidewall change
+7.0 mm
revs/km: 500.7
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/compare/235-35-r19-vs-255-35-r18Detailed comparison
| Metric | 235/35 R19 | 255/35 R18 | Difference |
|---|---|---|---|
| Overall diameter | 647.1 mm | 635.7 mm | -11.4 mm (-1.76%) |
| Sidewall height | 82.3 mm | 89.3 mm | +7.0 mm |
| Circumference | 2.033 m | 1.997 m | -35.8 mm |
| Revs / km | 491.9 | 500.7 | +8.8 |
| Ground clearance | reference | -5.7 mm | -5.7 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 255/35 R18 — 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 -5.7 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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255/35 R18
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