Comparison
225/50 R18 vs 235/55 R17
235/55 R17 drops the rim from 18 to 17 inches versus 225/50 R18, trading wheel size for taller sidewall. This swap lands within OEM rolling-diameter tolerance. Extra sidewall absorbs impacts more readily — a sensible bias for daily commuting and broken pavement.
The speedometer offset is mild and well inside what most cars can tolerate without recalibration. Overall the swap sits inside the safe ±3% diameter window, so ABS, traction control and gearing behave normally.
TakeTypical choice for a dedicated winter or off-road setup where extra sidewall pays off.
Quick math: 235/55 R17 is 8.1 mm taller than 225/50 R18, shifting the speedometer by +1.19%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
+8.1 mm
1.19%
Speedometer at 100
101.2 km/h
+1.19% error
Ground clearance
+4.0 mm
ride height delta
Sidewall change
+16.8 mm
revs/km: 461.1
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/compare/225-50-r18-vs-235-55-r17Detailed comparison
| Metric | 225/50 R18 | 235/55 R17 | Difference |
|---|---|---|---|
| Overall diameter | 682.2 mm | 690.3 mm | +8.1 mm (+1.19%) |
| Sidewall height | 112.5 mm | 129.3 mm | +16.8 mm |
| Circumference | 2.143 m | 2.169 m | +25.4 mm |
| Revs / km | 466.6 | 461.1 | -5.5 |
| Ground clearance | reference | +4.0 mm | +4.0 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 101.2 km/h | +1.19 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 101.2 km/h after switching to 235/55 R17 — a +1.19% 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 +4.0 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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225/50 R18
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235/55 R17
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