Comparison
225/50 R18 vs 225/45 R17
Compared to 225/50 R18, 225/45 R17 is 47.9 mm shorter and changes the speedometer reading by -7.02%.
Current Tire
225/50R18
New Tire
225/45R17
225/50 R18
225/45 R17
Ground line · scaled comparison
Not Recommended
Over 5% — speedometer & ABS may misread
Diameter change
-47.9 mm
-7.02%
Speedometer at 100
93.0 km/h
-7.02% error
Ground clearance
-24.0 mm
ride height delta
Sidewall change
-11.3 mm
revs/km: 501.8
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/compare/225-50-r18-vs-225-45-r17Detailed comparison
| Metric | 225/50 R18 | 225/45 R17 | Difference |
|---|---|---|---|
| Overall diameter | 682.2 mm | 634.3 mm | -47.9 mm (-7.02%) |
| Sidewall height | 112.5 mm | 101.3 mm | -11.3 mm |
| Circumference | 2.143 m | 1.993 m | -150.5 mm |
| Revs / km | 466.6 | 501.8 | +35.2 |
| Ground clearance | reference | -24.0 mm | -24.0 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 93.0 km/h | -7.02 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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225/50 R18
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225/45 R17