Comparison
235/50 R18 vs 225/45 R17
Compared to 235/50 R18, 225/45 R17 is 57.9 mm shorter and changes the speedometer reading by -8.36%.
Current Tire
235/50R18
New Tire
225/45R17
235/50 R18
225/45 R17
Ground line · scaled comparison
Not Recommended
Over 5% — speedometer & ABS may misread
Diameter change
-57.9 mm
-8.36%
Speedometer at 100
91.6 km/h
-8.36% error
Ground clearance
-29.0 mm
ride height delta
Sidewall change
-16.3 mm
revs/km: 501.8
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/compare/235-50-r18-vs-225-45-r17Detailed comparison
| Metric | 235/50 R18 | 225/45 R17 | Difference |
|---|---|---|---|
| Overall diameter | 692.2 mm | 634.3 mm | -57.9 mm (-8.36%) |
| Sidewall height | 117.5 mm | 101.3 mm | -16.3 mm |
| Circumference | 2.175 m | 1.993 m | -181.9 mm |
| Revs / km | 459.9 | 501.8 | +42.0 |
| Ground clearance | reference | -29.0 mm | -29.0 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 91.6 km/h | -8.36 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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235/50 R18
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225/45 R17