Comparison
245/45 R20 vs 225/45 R17
Compared to 245/45 R20, 225/45 R17 is 94.2 mm shorter and changes the speedometer reading by -12.93%.
Current Tire
245/45R20
New Tire
225/45R17
245/45 R20
225/45 R17
Ground line · scaled comparison
Not Recommended
Over 5% — speedometer & ABS may misread
Diameter change
-94.2 mm
-12.93%
Speedometer at 100
87.1 km/h
-12.93% error
Ground clearance
-47.1 mm
ride height delta
Sidewall change
-9.0 mm
revs/km: 501.8
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/compare/245-45-r20-vs-225-45-r17Detailed comparison
| Metric | 245/45 R20 | 225/45 R17 | Difference |
|---|---|---|---|
| Overall diameter | 728.5 mm | 634.3 mm | -94.2 mm (-12.93%) |
| Sidewall height | 110.3 mm | 101.3 mm | -9.0 mm |
| Circumference | 2.289 m | 1.993 m | -295.9 mm |
| Revs / km | 436.9 | 501.8 | +64.9 |
| Ground clearance | reference | -47.1 mm | -47.1 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 87.1 km/h | -12.93 km/h |
Verdict: danger
Over 5% diameter difference — likely to affect speedometer accuracy, ABS calibration and gearing. Not recommended without professional review.
Back to
245/45 R20
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225/45 R17