Comparison
225/55 R18 vs 235/60 R18
On the same 18-inch wheel, 235/60 R18 grows the section width by 10 mm versus 225/55 R18. This tire combination 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. 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.
TakeUseful when extra dry grip and stance matter more than a small fuel-economy hit.
Quick math: 235/60 R18 is 34.5 mm taller than 225/55 R18, shifting the speedometer by +4.90%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
+34.5 mm
4.90%
Speedometer at 100
104.9 km/h
+4.90% error
Ground clearance
+17.3 mm
ride height delta
Sidewall change
+17.3 mm
revs/km: 430.6
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/compare/225-55-r18-vs-235-60-r18Detailed comparison
| Metric | 225/55 R18 | 235/60 R18 | Difference |
|---|---|---|---|
| Overall diameter | 704.7 mm | 739.2 mm | +34.5 mm (+4.90%) |
| Sidewall height | 123.8 mm | 141.0 mm | +17.3 mm |
| Circumference | 2.214 m | 2.322 m | +108.4 mm |
| Revs / km | 451.7 | 430.6 | -21.1 |
| Ground clearance | reference | +17.3 mm | +17.3 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 104.9 km/h | +4.90 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 104.9 km/h after switching to 235/60 R18 — a +4.90% 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 +17.3 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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225/55 R18
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235/60 R18
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