Comparison
155/80 R13 vs 185/60 R15
185/60 R15 is a plus-2 alternative to 155/80 R13 — the bigger wheel shows through a thinner sidewall. This swap moves rolling diameter well outside the usual OEM tolerance.
The speedometer error is noticeable and may warrant a recalibration if you rely on indicated speed. Less sidewall flex usually translates to crisper turn-in and a slightly stiffer ride over rough pavement. More tread on the ground tends to improve dry grip and stance, with a small fuel-economy and clearance tradeoff. The larger wheel shows more of the brake hardware and tightens up the wheel-gap look. The 3–5% diameter gap puts this in caution territory: doable on many cars, but verify clearance and consider recalibration.
TakeCommon upgrade for sportier handling and a tighter wheel-gap look on the same vehicle.
Quick math: 185/60 R15 is 24.8 mm taller than 155/80 R13, shifting the speedometer by +4.29%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
+24.8 mm
4.29%
Speedometer at 100
104.3 km/h
+4.29% error
Ground clearance
+12.4 mm
ride height delta
Sidewall change
-13.0 mm
revs/km: 527.9
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/compare/155-80-r13-vs-185-60-r15Detailed comparison
| Metric | 155/80 R13 | 185/60 R15 | Difference |
|---|---|---|---|
| Overall diameter | 578.2 mm | 603.0 mm | +24.8 mm (+4.29%) |
| Sidewall height | 124.0 mm | 111.0 mm | -13.0 mm |
| Circumference | 1.816 m | 1.894 m | +77.9 mm |
| Revs / km | 550.5 | 527.9 | -22.6 |
| Ground clearance | reference | +12.4 mm | +12.4 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 104.3 km/h | +4.29 km/h |
Verdict: warning
Between 3% and 5% — noticeable speedometer drift; recalibration may be advisable.
Speedometer impact
At a true 100 km/h, your dashboard will read 104.3 km/h after switching to 185/60 R15 — a +4.29% offset. Use the speedometer error calculator to recheck for other indicated speeds, and the speedometer error guide for the full background.
Ground clearance change
The new tire's half-diameter changes ride height by +12.4 mm. Small differences are absorbed by suspension travel, but anything beyond ±10 mm can affect headlight aim, fender clearance and bump-stop margin. See the plus-sizing guide before committing.
Back to
155/80 R13
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185/60 R15
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