Comparison
255/35 R19 vs 255/40 R17
Going from 255/35 R19 to 255/40 R17 is a minus-2 setup that adds sidewall on a smaller 17-inch wheel. This wheel and tire pairing noticeably changes overall diameter compared to OEM.
The speedometer error is noticeable and may warrant a recalibration if you rely on indicated speed. The taller sidewall adds cushioning over potholes and rougher roads, with a softer overall ride. Minus-sizing keeps replacement costs down and opens up a wider range of winter and all-terrain tires. Diameter delta falls in the cautious 3–5% range, where speedometer recalibration and a careful clearance check are worth doing.
TakeTypical choice for a dedicated winter or off-road setup where extra sidewall pays off.
Quick math: 255/40 R17 is 25.3 mm shorter than 255/35 R19, shifting the speedometer by -3.83%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
-25.3 mm
-3.83%
Speedometer at 100
96.2 km/h
-3.83% error
Ground clearance
-12.6 mm
ride height delta
Sidewall change
+12.8 mm
revs/km: 500.6
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/compare/255-35-r19-vs-255-40-r17Detailed comparison
| Metric | 255/35 R19 | 255/40 R17 | Difference |
|---|---|---|---|
| Overall diameter | 661.1 mm | 635.8 mm | -25.3 mm (-3.83%) |
| Sidewall height | 89.3 mm | 102.0 mm | +12.8 mm |
| Circumference | 2.077 m | 1.997 m | -79.5 mm |
| Revs / km | 481.5 | 500.6 | +19.2 |
| Ground clearance | reference | -12.6 mm | -12.6 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 96.2 km/h | -3.83 km/h |
Verdict: warning
Between 3% and 5% — noticeable speedometer drift; recalibration may be advisable.
Speedometer impact
At a true 100 km/h, your dashboard will read 96.2 km/h after switching to 255/40 R17 — a -3.83% 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 -12.6 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.
Back to
255/35 R19
Back to
255/40 R17
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