Comparison
225/45 R18 vs 255/35 R18
255/35 R18 is a lower-profile take on 225/45 R18 — same 18-inch wheel, shorter sidewall. This wheel and tire pairing swings rolling diameter far enough to feel on the road.
The speedometer error is noticeable and may warrant a recalibration if you rely on indicated speed. Less sidewall flex usually translates to crisper turn-in and a slightly stiffer ride over rough pavement. The wider section adds contact patch and lateral stability, while eating into fender and suspension clearance. Diameter delta falls in the cautious 3–5% range, where speedometer recalibration and a careful clearance check are worth doing.
TakeSuits drivers who value sharper steering and appearance over outright ride softness.
Quick math: 255/35 R18 is 24.0 mm shorter than 225/45 R18, shifting the speedometer by -3.64%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
-24.0 mm
-3.64%
Speedometer at 100
96.4 km/h
-3.64% error
Ground clearance
-12.0 mm
ride height delta
Sidewall change
-12.0 mm
revs/km: 500.7
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/compare/225-45-r18-vs-255-35-r18Detailed comparison
| Metric | 225/45 R18 | 255/35 R18 | Difference |
|---|---|---|---|
| Overall diameter | 659.7 mm | 635.7 mm | -24.0 mm (-3.64%) |
| Sidewall height | 101.3 mm | 89.3 mm | -12.0 mm |
| Circumference | 2.073 m | 1.997 m | -75.4 mm |
| Revs / km | 482.5 | 500.7 | +18.2 |
| Ground clearance | reference | -12.0 mm | -12.0 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 96.4 km/h | -3.64 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 96.4 km/h after switching to 255/35 R18 — a -3.64% 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 -12.0 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.
Back to
225/45 R18
Back to
255/35 R18
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