Comparison
225/55 R18 vs 225/45 R17
Compared to 225/55 R18, 225/45 R17 is 70.4 mm shorter and changes the speedometer reading by -9.99%.
Current Tire
225/55R18
New Tire
225/45R17
225/55 R18
225/45 R17
Ground line · scaled comparison
Not Recommended
Over 5% — speedometer & ABS may misread
Diameter change
-70.4 mm
-9.99%
Speedometer at 100
90.0 km/h
-9.99% error
Ground clearance
-35.2 mm
ride height delta
Sidewall change
-22.5 mm
revs/km: 501.8
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/compare/225-55-r18-vs-225-45-r17Detailed comparison
| Metric | 225/55 R18 | 225/45 R17 | Difference |
|---|---|---|---|
| Overall diameter | 704.7 mm | 634.3 mm | -70.4 mm (-9.99%) |
| Sidewall height | 123.8 mm | 101.3 mm | -22.5 mm |
| Circumference | 2.214 m | 1.993 m | -221.2 mm |
| Revs / km | 451.7 | 501.8 | +50.1 |
| Ground clearance | reference | -35.2 mm | -35.2 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 90.0 km/h | -9.99 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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225/55 R18
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225/45 R17