Comparison
215/45 R18 vs 245/35 R18
Going from 215/45 R18 to 245/35 R18 keeps the rim but tightens the sidewall for a sportier look. This alternative fitment 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. Expect a more planted steering feel, at the cost of some of the cushioning a taller sidewall provides. 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: 245/35 R18 is 22.0 mm shorter than 215/45 R18, shifting the speedometer by -3.38%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
-22.0 mm
-3.38%
Speedometer at 100
96.6 km/h
-3.38% error
Ground clearance
-11.0 mm
ride height delta
Sidewall change
-11.0 mm
revs/km: 506.3
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/compare/215-45-r18-vs-245-35-r18Detailed comparison
| Metric | 215/45 R18 | 245/35 R18 | Difference |
|---|---|---|---|
| Overall diameter | 650.7 mm | 628.7 mm | -22.0 mm (-3.38%) |
| Sidewall height | 96.8 mm | 85.8 mm | -11.0 mm |
| Circumference | 2.044 m | 1.975 m | -69.1 mm |
| Revs / km | 489.2 | 506.3 | +17.1 |
| Ground clearance | reference | -11.0 mm | -11.0 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 96.6 km/h | -3.38 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 96.6 km/h after switching to 245/35 R18 — a -3.38% 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 -11.0 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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215/45 R18
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245/35 R18
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