Comparison
255/40 R19 vs 285/35 R19
On the same 19-inch wheel, 285/35 R19 grows the section width by 30 mm versus 255/40 R19. This sizing approach preserves rolling diameter within a hair of the original. The speedometer offset is mild and well inside what most cars can tolerate without recalibration. The shorter sidewall gives the tire a firmer, more responsive feel and sharpens steering input. Overall the swap sits inside the safe ±3% diameter window, so ABS, traction control and gearing behave normally.
TakeUseful when extra dry grip and stance matter more than a small fuel-economy hit.
Quick math: 285/35 R19 is 4.5 mm shorter than 255/40 R19, shifting the speedometer by -0.66%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-4.5 mm
-0.66%
Speedometer at 100
99.3 km/h
-0.66% error
Ground clearance
-2.3 mm
ride height delta
Sidewall change
-2.3 mm
revs/km: 466.7
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/compare/255-40-r19-vs-285-35-r19Detailed comparison
| Metric | 255/40 R19 | 285/35 R19 | Difference |
|---|---|---|---|
| Overall diameter | 686.6 mm | 682.1 mm | -4.5 mm (-0.66%) |
| Sidewall height | 102.0 mm | 99.8 mm | -2.3 mm |
| Circumference | 2.157 m | 2.143 m | -14.1 mm |
| Revs / km | 463.6 | 466.7 | +3.1 |
| Ground clearance | reference | -2.3 mm | -2.3 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 99.3 km/h | -0.66 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 99.3 km/h after switching to 285/35 R19 — a -0.66% 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 -2.3 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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255/40 R19
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285/35 R19
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