Comparison
215/55 R16 vs 245/35 R18
Plus-sizing from 215/55 R16 to 245/35 R18 keeps overall diameter close to factory while opening room for a larger 18-inch wheel. This setup trims or stretches rolling diameter by a small margin. The shorter sidewall gives the tire a firmer, more responsive feel and sharpens steering input.
The speedometer offset is small but measurable; worth keeping in mind if you watch the dash closely. Diameter change stays inside the conservative ±3% safety window — an OEM-safe fitment on most vehicles.
TakeCommon upgrade for sportier handling and a tighter wheel-gap look on the same vehicle.
Quick math: 245/35 R18 is 14.2 mm shorter than 215/55 R16, shifting the speedometer by -2.21%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-14.2 mm
-2.21%
Speedometer at 100
97.8 km/h
-2.21% error
Ground clearance
-7.1 mm
ride height delta
Sidewall change
-32.5 mm
revs/km: 506.3
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/compare/215-55-r16-vs-245-35-r18Detailed comparison
| Metric | 215/55 R16 | 245/35 R18 | Difference |
|---|---|---|---|
| Overall diameter | 642.9 mm | 628.7 mm | -14.2 mm (-2.21%) |
| Sidewall height | 118.3 mm | 85.8 mm | -32.5 mm |
| Circumference | 2.020 m | 1.975 m | -44.6 mm |
| Revs / km | 495.1 | 506.3 | +11.2 |
| Ground clearance | reference | -7.1 mm | -7.1 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 97.8 km/h | -2.21 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 245/35 R18 — a -2.21% 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 -7.1 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
215/55 R16
Back to
245/35 R18
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