Comparison
245/60 R18 vs 225/45 R17
Compared to 245/60 R18, 225/45 R17 is 116.9 mm shorter and changes the speedometer reading by -15.56%.
Current Tire
245/60R18
New Tire
225/45R17
245/60 R18
225/45 R17
Ground line · scaled comparison
Not Recommended
Over 5% — speedometer & ABS may misread
Diameter change
-116.9 mm
-15.56%
Speedometer at 100
84.4 km/h
-15.56% error
Ground clearance
-58.5 mm
ride height delta
Sidewall change
-45.8 mm
revs/km: 501.8
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/compare/245-60-r18-vs-225-45-r17Detailed comparison
| Metric | 245/60 R18 | 225/45 R17 | Difference |
|---|---|---|---|
| Overall diameter | 751.2 mm | 634.3 mm | -116.9 mm (-15.56%) |
| Sidewall height | 147.0 mm | 101.3 mm | -45.8 mm |
| Circumference | 2.360 m | 1.993 m | -367.3 mm |
| Revs / km | 423.7 | 501.8 | +78.1 |
| Ground clearance | reference | -58.5 mm | -58.5 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 84.4 km/h | -15.56 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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245/60 R18
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225/45 R17