Comparison
255/45 R20 vs 225/45 R17
Compared to 255/45 R20, 225/45 R17 is 103.2 mm shorter and changes the speedometer reading by -13.99%.
Current Tire
255/45R20
New Tire
225/45R17
255/45 R20
225/45 R17
Ground line · scaled comparison
Not Recommended
Over 5% — speedometer & ABS may misread
Diameter change
-103.2 mm
-13.99%
Speedometer at 100
86.0 km/h
-13.99% error
Ground clearance
-51.6 mm
ride height delta
Sidewall change
-13.5 mm
revs/km: 501.8
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/compare/255-45-r20-vs-225-45-r17Detailed comparison
| Metric | 255/45 R20 | 225/45 R17 | Difference |
|---|---|---|---|
| Overall diameter | 737.5 mm | 634.3 mm | -103.2 mm (-13.99%) |
| Sidewall height | 114.8 mm | 101.3 mm | -13.5 mm |
| Circumference | 2.317 m | 1.993 m | -324.2 mm |
| Revs / km | 431.6 | 501.8 | +70.2 |
| Ground clearance | reference | -51.6 mm | -51.6 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 86.0 km/h | -13.99 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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255/45 R20
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225/45 R17