Comparison
255/35 R19 vs 275/35 R18
275/35 R18 drops the rim from 19 to 18 inches versus 255/35 R19, trading wheel size for taller sidewall. This tire combination trims or stretches rolling diameter by a small margin.
Expect a slight but noticeable shift in indicated speed compared to the original tires. The wider section adds contact patch and lateral stability, while eating into fender and suspension clearance. The smaller wheel is also lighter and easier to find affordable winter rubber for. Diameter change stays inside the conservative ±3% safety window — an OEM-safe fitment on most vehicles.
TakePractical direction for winter wheels, chains, or rougher pavement where cushioning matters.
Quick math: 275/35 R18 is 11.4 mm shorter than 255/35 R19, shifting the speedometer by -1.72%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-11.4 mm
-1.72%
Speedometer at 100
98.3 km/h
-1.72% error
Ground clearance
-5.7 mm
ride height delta
Sidewall change
+7.0 mm
revs/km: 489.9
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/compare/255-35-r19-vs-275-35-r18Detailed comparison
| Metric | 255/35 R19 | 275/35 R18 | Difference |
|---|---|---|---|
| Overall diameter | 661.1 mm | 649.7 mm | -11.4 mm (-1.72%) |
| Sidewall height | 89.3 mm | 96.3 mm | +7.0 mm |
| Circumference | 2.077 m | 2.041 m | -35.8 mm |
| Revs / km | 481.5 | 489.9 | +8.4 |
| Ground clearance | reference | -5.7 mm | -5.7 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 98.3 km/h | -1.72 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 98.3 km/h after switching to 275/35 R18 — a -1.72% 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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255/35 R19
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275/35 R18
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