Comparison
285/60 R18 vs 225/45 R17
Compared to 285/60 R18, 225/45 R17 is 164.9 mm shorter and changes the speedometer reading by -20.63%.
Current Tire
285/60R18
New Tire
225/45R17
285/60 R18
225/45 R17
Ground line · scaled comparison
Not Recommended
Over 5% — speedometer & ABS may misread
Diameter change
-164.9 mm
-20.63%
Speedometer at 100
79.4 km/h
-20.63% error
Ground clearance
-82.5 mm
ride height delta
Sidewall change
-69.8 mm
revs/km: 501.8
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/compare/285-60-r18-vs-225-45-r17Detailed comparison
| Metric | 285/60 R18 | 225/45 R17 | Difference |
|---|---|---|---|
| Overall diameter | 799.2 mm | 634.3 mm | -164.9 mm (-20.63%) |
| Sidewall height | 171.0 mm | 101.3 mm | -69.8 mm |
| Circumference | 2.511 m | 1.993 m | -518.0 mm |
| Revs / km | 398.3 | 501.8 | +103.5 |
| Ground clearance | reference | -82.5 mm | -82.5 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 79.4 km/h | -20.63 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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285/60 R18
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225/45 R17