Comparison
215/60 R17 vs 215/40 R18
Compared to 215/60 R17, 215/40 R18 is 60.6 mm shorter and changes the speedometer reading by -8.79%.
Current Tire
215/60R17
New Tire
215/40R18
215/60 R17
215/40 R18
Ground line · scaled comparison
Not Recommended
Over 5% — speedometer & ABS may misread
Diameter change
-60.6 mm
-8.79%
Speedometer at 100
91.2 km/h
-8.79% error
Ground clearance
-30.3 mm
ride height delta
Sidewall change
-43.0 mm
revs/km: 505.9
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/compare/215-60-r17-vs-215-40-r18Detailed comparison
| Metric | 215/60 R17 | 215/40 R18 | Difference |
|---|---|---|---|
| Overall diameter | 689.8 mm | 629.2 mm | -60.6 mm (-8.79%) |
| Sidewall height | 129.0 mm | 86.0 mm | -43.0 mm |
| Circumference | 2.167 m | 1.977 m | -190.4 mm |
| Revs / km | 461.5 | 505.9 | +44.4 |
| Ground clearance | reference | -30.3 mm | -30.3 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 91.2 km/h | -8.79 km/h |
Verdict: danger
Over 5% diameter difference — likely to affect speedometer accuracy, ABS calibration and gearing. Not recommended without professional review.
Back to
215/60 R17
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215/40 R18