Comparison
215/65 R16 vs 225/55 R18
Going from 215/65 R16 to 225/55 R18 steps up to a 18-inch rim while trimming sidewall to stay near OEM rolling diameter. This swap shifts overall diameter slightly from OEM. The shorter sidewall gives the tire a firmer, more responsive feel and sharpens steering input.
Expect a slight but noticeable shift in indicated speed compared to the original tires. 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: 225/55 R18 is 18.8 mm taller than 215/65 R16, shifting the speedometer by +2.74%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
+18.8 mm
2.74%
Speedometer at 100
102.7 km/h
+2.74% error
Ground clearance
+9.4 mm
ride height delta
Sidewall change
-16.0 mm
revs/km: 451.7
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/compare/215-65-r16-vs-225-55-r18Detailed comparison
| Metric | 215/65 R16 | 225/55 R18 | Difference |
|---|---|---|---|
| Overall diameter | 685.9 mm | 704.7 mm | +18.8 mm (+2.74%) |
| Sidewall height | 139.8 mm | 123.8 mm | -16.0 mm |
| Circumference | 2.155 m | 2.214 m | +59.1 mm |
| Revs / km | 464.1 | 451.7 | -12.4 |
| Ground clearance | reference | +9.4 mm | +9.4 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 102.7 km/h | +2.74 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 102.7 km/h after switching to 225/55 R18 — a +2.74% 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 +9.4 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
215/65 R16
Back to
225/55 R18
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