Comparison
285/35 R20 vs 225/45 R17
Compared to 285/35 R20, 225/45 R17 is 73.2 mm shorter and changes the speedometer reading by -10.35%.
Current Tire
285/35R20
New Tire
225/45R17
285/35 R20
225/45 R17
Ground line · scaled comparison
Not Recommended
Over 5% — speedometer & ABS may misread
Diameter change
-73.2 mm
-10.35%
Speedometer at 100
89.7 km/h
-10.35% error
Ground clearance
-36.6 mm
ride height delta
Sidewall change
+1.5 mm
revs/km: 501.8
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/compare/285-35-r20-vs-225-45-r17Detailed comparison
| Metric | 285/35 R20 | 225/45 R17 | Difference |
|---|---|---|---|
| Overall diameter | 707.5 mm | 634.3 mm | -73.2 mm (-10.35%) |
| Sidewall height | 99.8 mm | 101.3 mm | +1.5 mm |
| Circumference | 2.223 m | 1.993 m | -230.0 mm |
| Revs / km | 449.9 | 501.8 | +51.9 |
| Ground clearance | reference | -36.6 mm | -36.6 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 89.7 km/h | -10.35 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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285/35 R20
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225/45 R17