Comparison
195/55 R16 vs 255/40 R17
255/40 R17 is a plus-1 alternative to 195/55 R16 — the bigger wheel shows through a thinner sidewall. This sizing approach shifts overall diameter slightly from OEM. The shorter sidewall gives the tire a firmer, more responsive feel and sharpens steering input.
The speedometer offset is small but measurable; worth keeping in mind if you watch the dash closely. 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 14.9 mm taller than 195/55 R16, shifting the speedometer by +2.40%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
+14.9 mm
2.40%
Speedometer at 100
102.4 km/h
+2.40% error
Ground clearance
+7.4 mm
ride height delta
Sidewall change
-5.3 mm
revs/km: 500.6
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/compare/195-55-r16-vs-255-40-r17Detailed comparison
| Metric | 195/55 R16 | 255/40 R17 | Difference |
|---|---|---|---|
| Overall diameter | 620.9 mm | 635.8 mm | +14.9 mm (+2.40%) |
| Sidewall height | 107.3 mm | 102.0 mm | -5.3 mm |
| Circumference | 1.951 m | 1.997 m | +46.8 mm |
| Revs / km | 512.7 | 500.6 | -12.0 |
| Ground clearance | reference | +7.4 mm | +7.4 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 102.4 km/h | +2.40 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 102.4 km/h after switching to 255/40 R17 — a +2.40% 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 +7.4 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
195/55 R16
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255/40 R17
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