Comparison
225/60 R17 vs 235/45 R18
Plus-sizing from 225/60 R17 to 235/45 R18 keeps overall diameter close to factory while opening room for a larger 18-inch wheel. This sizing approach noticeably changes overall diameter compared to OEM. The shorter sidewall gives the tire a firmer, more responsive feel and sharpens steering input.
The speedometer error is noticeable and may warrant a recalibration if you rely on indicated speed. Diameter delta falls in the cautious 3–5% range, where speedometer recalibration and a careful clearance check are worth doing.
TakeCommon upgrade for sportier handling and a tighter wheel-gap look on the same vehicle.
Quick math: 235/45 R18 is 33.1 mm shorter than 225/60 R17, shifting the speedometer by -4.72%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
-33.1 mm
-4.72%
Speedometer at 100
95.3 km/h
-4.72% error
Ground clearance
-16.5 mm
ride height delta
Sidewall change
-29.3 mm
revs/km: 476.0
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/compare/225-60-r17-vs-235-45-r18Detailed comparison
| Metric | 225/60 R17 | 235/45 R18 | Difference |
|---|---|---|---|
| Overall diameter | 701.8 mm | 668.7 mm | -33.1 mm (-4.72%) |
| Sidewall height | 135.0 mm | 105.8 mm | -29.3 mm |
| Circumference | 2.205 m | 2.101 m | -104.0 mm |
| Revs / km | 453.6 | 476.0 | +22.5 |
| Ground clearance | reference | -16.5 mm | -16.5 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 95.3 km/h | -4.72 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 95.3 km/h after switching to 235/45 R18 — a -4.72% 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 -16.5 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
225/60 R17
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235/45 R18
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