Comparison
255/55 R16 vs 205/40 R17
Compared to 255/55 R16, 205/40 R17 is 91.1 mm shorter and changes the speedometer reading by -13.26%.
Current Tire
255/55R16
New Tire
205/40R17
255/55 R16
205/40 R17
Ground line · scaled comparison
Not Recommended
Over 5% — speedometer & ABS may misread
Diameter change
-91.1 mm
-13.26%
Speedometer at 100
86.7 km/h
-13.26% error
Ground clearance
-45.6 mm
ride height delta
Sidewall change
-58.3 mm
revs/km: 534.3
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/compare/255-55-r16-vs-205-40-r17Detailed comparison
| Metric | 255/55 R16 | 205/40 R17 | Difference |
|---|---|---|---|
| Overall diameter | 686.9 mm | 595.8 mm | -91.1 mm (-13.26%) |
| Sidewall height | 140.3 mm | 82.0 mm | -58.3 mm |
| Circumference | 2.158 m | 1.872 m | -286.2 mm |
| Revs / km | 463.4 | 534.3 | +70.9 |
| Ground clearance | reference | -45.6 mm | -45.6 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 86.7 km/h | -13.26 km/h |
Verdict: danger
Over 5% diameter difference — likely to affect speedometer accuracy, ABS calibration and gearing. Not recommended without professional review.
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255/55 R16
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205/40 R17