Comparison
235/55 R18 vs 245/60 R18
245/60 R18 is a wider variation of 235/55 R18 on the same 18-inch rim, adding 10 mm of tread footprint. This tire combination swings rolling diameter far enough to feel on the road. The speedometer error is noticeable and may warrant a recalibration if you rely on indicated speed. The taller sidewall adds cushioning over potholes and rougher roads, with a softer overall ride. The 3–5% diameter gap puts this in caution territory: doable on many cars, but verify clearance and consider recalibration.
TakeUseful when extra dry grip and stance matter more than a small fuel-economy hit.
Quick math: 245/60 R18 is 35.5 mm taller than 235/55 R18, shifting the speedometer by +4.96%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
+35.5 mm
4.96%
Speedometer at 100
105.0 km/h
+4.96% error
Ground clearance
+17.8 mm
ride height delta
Sidewall change
+17.8 mm
revs/km: 423.7
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/compare/235-55-r18-vs-245-60-r18Detailed comparison
| Metric | 235/55 R18 | 245/60 R18 | Difference |
|---|---|---|---|
| Overall diameter | 715.7 mm | 751.2 mm | +35.5 mm (+4.96%) |
| Sidewall height | 129.3 mm | 147.0 mm | +17.8 mm |
| Circumference | 2.248 m | 2.360 m | +111.5 mm |
| Revs / km | 444.8 | 423.7 | -21.0 |
| Ground clearance | reference | +17.8 mm | +17.8 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 105.0 km/h | +4.96 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 105.0 km/h after switching to 245/60 R18 — a +4.96% 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 +17.8 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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245/60 R18
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