Comparison
155/70 R13 vs 185/55 R15
Compared to 155/70 R13, 185/55 R15 is 37.3 mm taller and changes the speedometer reading by +6.82%.
Current Tire
155/70R13
New Tire
185/55R15
155/70 R13
185/55 R15
Ground line · scaled comparison
Not Recommended
Over 5% — speedometer & ABS may misread
Diameter change
+37.3 mm
6.82%
Speedometer at 100
106.8 km/h
+6.82% error
Ground clearance
+18.6 mm
ride height delta
Sidewall change
-6.8 mm
revs/km: 544.6
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/compare/155-70-r13-vs-185-55-r15Detailed comparison
| Metric | 155/70 R13 | 185/55 R15 | Difference |
|---|---|---|---|
| Overall diameter | 547.2 mm | 584.5 mm | +37.3 mm (+6.82%) |
| Sidewall height | 108.5 mm | 101.8 mm | -6.8 mm |
| Circumference | 1.719 m | 1.836 m | +117.2 mm |
| Revs / km | 581.7 | 544.6 | -37.1 |
| Ground clearance | reference | +18.6 mm | +18.6 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 106.8 km/h | +6.82 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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155/70 R13
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185/55 R15