Comparison
225/60 R17 vs 255/45 R18
Going from 225/60 R17 to 255/45 R18 steps up to a 18-inch rim while trimming sidewall to stay near OEM rolling diameter. This alternative fitment trims or stretches rolling diameter by a small margin. Expect a slight but noticeable shift in indicated speed compared to the original tires. Expect a more planted steering feel, at the cost of some of the cushioning a taller sidewall provides. Overall the swap sits inside the safe ±3% diameter window, so ABS, traction control and gearing behave normally.
TakeA solid pick for drivers chasing a more aggressive stance without abandoning OEM rolling diameter.
Quick math: 255/45 R18 is 15.1 mm shorter than 225/60 R17, shifting the speedometer by -2.15%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-15.1 mm
-2.15%
Speedometer at 100
97.8 km/h
-2.15% error
Ground clearance
-7.5 mm
ride height delta
Sidewall change
-20.3 mm
revs/km: 463.5
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/compare/225-60-r17-vs-255-45-r18Detailed comparison
| Metric | 225/60 R17 | 255/45 R18 | Difference |
|---|---|---|---|
| Overall diameter | 701.8 mm | 686.7 mm | -15.1 mm (-2.15%) |
| Sidewall height | 135.0 mm | 114.8 mm | -20.3 mm |
| Circumference | 2.205 m | 2.157 m | -47.4 mm |
| Revs / km | 453.6 | 463.5 | +10.0 |
| Ground clearance | reference | -7.5 mm | -7.5 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 97.8 km/h | -2.15 km/h |
Verdict: excellent
Within ±3% — speedometer, ABS and traction control should behave normally.
Speedometer impact
At a true 100 km/h, your dashboard will read 97.8 km/h after switching to 255/45 R18 — a -2.15% 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 -7.5 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.
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225/60 R17
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255/45 R18
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