Comparison
255/45 R18 vs 265/35 R19
265/35 R19 is a plus-1 alternative to 255/45 R18 — the bigger wheel shows through a thinner sidewall. This swap trims or stretches rolling diameter by a small margin. Expect a more planted steering feel, at the cost of some of the cushioning a taller sidewall provides.
Expect a slight but noticeable shift in indicated speed compared to the original tires. 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: 265/35 R19 is 18.6 mm shorter than 255/45 R18, shifting the speedometer by -2.71%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-18.6 mm
-2.71%
Speedometer at 100
97.3 km/h
-2.71% error
Ground clearance
-9.3 mm
ride height delta
Sidewall change
-22.0 mm
revs/km: 476.4
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/compare/255-45-r18-vs-265-35-r19Detailed comparison
| Metric | 255/45 R18 | 265/35 R19 | Difference |
|---|---|---|---|
| Overall diameter | 686.7 mm | 668.1 mm | -18.6 mm (-2.71%) |
| Sidewall height | 114.8 mm | 92.8 mm | -22.0 mm |
| Circumference | 2.157 m | 2.099 m | -58.4 mm |
| Revs / km | 463.5 | 476.4 | +12.9 |
| Ground clearance | reference | -9.3 mm | -9.3 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 97.3 km/h | -2.71 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 97.3 km/h after switching to 265/35 R19 — a -2.71% 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 -9.3 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.
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255/45 R18
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265/35 R19
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