Comparison
215/55 R16 vs 255/40 R17
255/40 R17 is a plus-1 alternative to 215/55 R16 — the bigger wheel shows through a thinner sidewall. This swap keeps overall diameter very close to stock. 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.
TakeCommon upgrade for sportier handling and a tighter wheel-gap look on the same vehicle.
Quick math: 255/40 R17 is 7.1 mm shorter than 215/55 R16, shifting the speedometer by -1.10%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-7.1 mm
-1.10%
Speedometer at 100
98.9 km/h
-1.10% error
Ground clearance
-3.6 mm
ride height delta
Sidewall change
-16.3 mm
revs/km: 500.6
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/compare/215-55-r16-vs-255-40-r17Detailed comparison
| Metric | 215/55 R16 | 255/40 R17 | Difference |
|---|---|---|---|
| Overall diameter | 642.9 mm | 635.8 mm | -7.1 mm (-1.10%) |
| Sidewall height | 118.3 mm | 102.0 mm | -16.3 mm |
| Circumference | 2.020 m | 1.997 m | -22.3 mm |
| Revs / km | 495.1 | 500.6 | +5.5 |
| Ground clearance | reference | -3.6 mm | -3.6 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 98.9 km/h | -1.10 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 98.9 km/h after switching to 255/40 R17 — a -1.10% 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 -3.6 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
215/55 R16
Back to
255/40 R17
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