Comparison
225/50 R17 vs 255/40 R17
255/40 R17 is a lower-profile take on 225/50 R17 — same 17-inch wheel, shorter sidewall. This alternative fitment moves rolling diameter well outside the usual OEM tolerance.
The speedometer error is noticeable and may warrant a recalibration if you rely on indicated speed. Expect a more planted steering feel, at the cost of some of the cushioning a taller sidewall provides. 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.
TakeSuits drivers who value sharper steering and appearance over outright ride softness.
Quick math: 255/40 R17 is 21.0 mm shorter than 225/50 R17, shifting the speedometer by -3.20%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
-21.0 mm
-3.20%
Speedometer at 100
96.8 km/h
-3.20% error
Ground clearance
-10.5 mm
ride height delta
Sidewall change
-10.5 mm
revs/km: 500.6
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/compare/225-50-r17-vs-255-40-r17Detailed comparison
| Metric | 225/50 R17 | 255/40 R17 | Difference |
|---|---|---|---|
| Overall diameter | 656.8 mm | 635.8 mm | -21.0 mm (-3.20%) |
| Sidewall height | 112.5 mm | 102.0 mm | -10.5 mm |
| Circumference | 2.063 m | 1.997 m | -66.0 mm |
| Revs / km | 484.6 | 500.6 | +16.0 |
| Ground clearance | reference | -10.5 mm | -10.5 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 96.8 km/h | -3.20 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 96.8 km/h after switching to 255/40 R17 — a -3.20% 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 -10.5 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
225/50 R17
Back to
255/40 R17
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