Comparison
225/50 R18 vs 225/55 R16
225/55 R16 drops the rim from 18 to 16 inches versus 225/50 R18, trading wheel size for taller sidewall. This tire combination swings rolling diameter far enough to feel on the road. More sidewall typically improves comfort and curb protection, especially on city streets.
Indicated speed will drift far enough that recalibration is worth considering. The 3–5% diameter gap puts this in caution territory: doable on many cars, but verify clearance and consider recalibration.
TakeTypical choice for a dedicated winter or off-road setup where extra sidewall pays off.
Quick math: 225/55 R16 is 28.3 mm shorter than 225/50 R18, shifting the speedometer by -4.15%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
-28.3 mm
-4.15%
Speedometer at 100
95.9 km/h
-4.15% error
Ground clearance
-14.2 mm
ride height delta
Sidewall change
+11.3 mm
revs/km: 486.8
Permalink for this comparison:
/compare/225-50-r18-vs-225-55-r16Detailed comparison
| Metric | 225/50 R18 | 225/55 R16 | Difference |
|---|---|---|---|
| Overall diameter | 682.2 mm | 653.9 mm | -28.3 mm (-4.15%) |
| Sidewall height | 112.5 mm | 123.8 mm | +11.3 mm |
| Circumference | 2.143 m | 2.054 m | -88.9 mm |
| Revs / km | 466.6 | 486.8 | +20.2 |
| Ground clearance | reference | -14.2 mm | -14.2 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 95.9 km/h | -4.15 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 95.9 km/h after switching to 225/55 R16 — a -4.15% 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 -14.2 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 R18
Back to
225/55 R16
Drivers also compare
Closely-related fitments and plus-size swaps for 225/50 R18 and 225/55 R16.
205/60 R16 vs 225/55 R16
Wider variation on the same rim — more grip, less clearance.
Δ 0.23%
225/50 R18 vs 245/45 R18
Wider variation on the same rim — more grip, less clearance.
Δ 0.66%
225/50 R18 vs 255/45 R18
Wider variation on the same rim — more grip, less clearance.
Δ 0.66%
225/50 R18 vs 275/40 R18
Wider variation on the same rim — more grip, less clearance.
Δ 0.73%
225/50 R18 vs 235/50 R18
Wider variation on the same rim — more grip, less clearance.
Δ 1.47%
215/60 R16 vs 225/55 R16
Wider variation on the same rim — more grip, less clearance.
Δ 1.58%
215/55 R16 vs 225/55 R16
Wider variation on the same rim — more grip, less clearance.
Δ 1.71%
225/50 R18 vs 265/40 R18
Wider variation on the same rim — more grip, less clearance.
Δ 1.91%
Related topics