Comparison
225/40 R19 vs 255/40 R17
255/40 R17 drops the rim from 19 to 17 inches versus 225/40 R19, trading wheel size for taller sidewall. This tire combination swings rolling diameter far enough to feel on the road. The speedometer error is noticeable and may warrant a recalibration if you rely on indicated speed. More tread on the ground tends to improve dry grip and stance, with a small fuel-economy and clearance tradeoff. Diameter delta falls in the cautious 3–5% range, where speedometer recalibration and a careful clearance check are worth doing.
TakePractical direction for winter wheels, chains, or rougher pavement where cushioning matters.
Quick math: 255/40 R17 is 26.8 mm shorter than 225/40 R19, shifting the speedometer by -4.04%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
-26.8 mm
-4.04%
Speedometer at 100
96.0 km/h
-4.04% error
Ground clearance
-13.4 mm
ride height delta
Sidewall change
+12.0 mm
revs/km: 500.6
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/compare/225-40-r19-vs-255-40-r17Detailed comparison
| Metric | 225/40 R19 | 255/40 R17 | Difference |
|---|---|---|---|
| Overall diameter | 662.6 mm | 635.8 mm | -26.8 mm (-4.04%) |
| Sidewall height | 90.0 mm | 102.0 mm | +12.0 mm |
| Circumference | 2.082 m | 1.997 m | -84.2 mm |
| Revs / km | 480.4 | 500.6 | +20.2 |
| Ground clearance | reference | -13.4 mm | -13.4 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 96.0 km/h | -4.04 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 96.0 km/h after switching to 255/40 R17 — a -4.04% 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 -13.4 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
225/40 R19
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255/40 R17
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