Comparison
225/55 R17 vs 245/45 R18
Compared to 225/55 R17, 245/45 R18 is 1.6 mm shorter and changes the speedometer reading by -0.24%.
Current Tire
225/55R17
New Tire
245/45R18
225/55 R17
245/45 R18
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-1.6 mm
-0.24%
Speedometer at 100
99.8 km/h
-0.24% error
Ground clearance
-0.8 mm
ride height delta
Sidewall change
-13.5 mm
revs/km: 469.7
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/compare/225-55-r17-vs-245-45-r18Detailed comparison
| Metric | 225/55 R17 | 245/45 R18 | Difference |
|---|---|---|---|
| Overall diameter | 679.3 mm | 677.7 mm | -1.6 mm (-0.24%) |
| Sidewall height | 123.8 mm | 110.3 mm | -13.5 mm |
| Circumference | 2.134 m | 2.129 m | -5.0 mm |
| Revs / km | 468.6 | 469.7 | +1.1 |
| Ground clearance | reference | -0.8 mm | -0.8 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 99.8 km/h | -0.24 km/h |
Verdict: excellent
Within ±3% — speedometer, ABS and traction control should behave normally.
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225/55 R17
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245/45 R18