Comparison
285/35 R21 vs 225/45 R17
Compared to 285/35 R21, 225/45 R17 is 98.6 mm shorter and changes the speedometer reading by -13.45%.
Current Tire
285/35R21
New Tire
225/45R17
285/35 R21
225/45 R17
Ground line · scaled comparison
Not Recommended
Over 5% — speedometer & ABS may misread
Diameter change
-98.6 mm
-13.45%
Speedometer at 100
86.5 km/h
-13.45% error
Ground clearance
-49.3 mm
ride height delta
Sidewall change
+1.5 mm
revs/km: 501.8
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/compare/285-35-r21-vs-225-45-r17Detailed comparison
| Metric | 285/35 R21 | 225/45 R17 | Difference |
|---|---|---|---|
| Overall diameter | 732.9 mm | 634.3 mm | -98.6 mm (-13.45%) |
| Sidewall height | 99.8 mm | 101.3 mm | +1.5 mm |
| Circumference | 2.302 m | 1.993 m | -309.8 mm |
| Revs / km | 434.3 | 501.8 | +67.5 |
| Ground clearance | reference | -49.3 mm | -49.3 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 86.5 km/h | -13.45 km/h |
Verdict: danger
Over 5% diameter difference — likely to affect speedometer accuracy, ABS calibration and gearing. Not recommended without professional review.
Back to
285/35 R21
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225/45 R17