Comparison
235/55 R18 vs 235/60 R18
235/60 R18 is a taller-sidewall alternative to 235/55 R18 on the same 18-inch rim. This wheel and tire pairing swings rolling diameter far enough to feel on the road. Indicated speed will drift far enough that recalibration is worth considering. More sidewall typically improves comfort and curb protection, especially on city streets. The 3–5% diameter gap puts this in caution territory: doable on many cars, but verify clearance and consider recalibration.
TakeA comfort-leaning direction that's easier on wheels and suspension over rough surfaces.
Quick math: 235/60 R18 is 23.5 mm taller than 235/55 R18, shifting the speedometer by +3.28%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
+23.5 mm
3.28%
Speedometer at 100
103.3 km/h
+3.28% error
Ground clearance
+11.8 mm
ride height delta
Sidewall change
+11.8 mm
revs/km: 430.6
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/compare/235-55-r18-vs-235-60-r18Detailed comparison
| Metric | 235/55 R18 | 235/60 R18 | Difference |
|---|---|---|---|
| Overall diameter | 715.7 mm | 739.2 mm | +23.5 mm (+3.28%) |
| Sidewall height | 129.3 mm | 141.0 mm | +11.8 mm |
| Circumference | 2.248 m | 2.322 m | +73.8 mm |
| Revs / km | 444.8 | 430.6 | -14.1 |
| Ground clearance | reference | +11.8 mm | +11.8 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 103.3 km/h | +3.28 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 103.3 km/h after switching to 235/60 R18 — a +3.28% 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 +11.8 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.
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235/55 R18
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235/60 R18
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