Comparison
225/50 R17 vs 275/35 R18
Going from 225/50 R17 to 275/35 R18 steps up to a 18-inch rim while trimming sidewall to stay near OEM rolling diameter. This alternative fitment keeps overall diameter very close to stock. Expect a more planted steering feel, at the cost of some of the cushioning a taller sidewall provides.
Speedometer drift stays small enough that most drivers won't notice it day to day. 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: 275/35 R18 is 7.1 mm shorter than 225/50 R17, shifting the speedometer by -1.08%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-7.1 mm
-1.08%
Speedometer at 100
98.9 km/h
-1.08% error
Ground clearance
-3.5 mm
ride height delta
Sidewall change
-16.3 mm
revs/km: 489.9
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/compare/225-50-r17-vs-275-35-r18Detailed comparison
| Metric | 225/50 R17 | 275/35 R18 | Difference |
|---|---|---|---|
| Overall diameter | 656.8 mm | 649.7 mm | -7.1 mm (-1.08%) |
| Sidewall height | 112.5 mm | 96.3 mm | -16.3 mm |
| Circumference | 2.063 m | 2.041 m | -22.3 mm |
| Revs / km | 484.6 | 489.9 | +5.3 |
| Ground clearance | reference | -3.5 mm | -3.5 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 98.9 km/h | -1.08 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 98.9 km/h after switching to 275/35 R18 — a -1.08% 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 -3.5 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
225/50 R17
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275/35 R18
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