Comparison
225/55 R18 vs 265/35 R20
265/35 R20 is a plus-2 alternative to 225/55 R18 — the bigger wheel shows through a thinner sidewall. This wheel and tire pairing shifts overall diameter slightly from OEM. Expect a more planted steering feel, at the cost of some of the cushioning a taller sidewall provides.
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: 265/35 R20 is 11.2 mm shorter than 225/55 R18, shifting the speedometer by -1.59%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-11.2 mm
-1.59%
Speedometer at 100
98.4 km/h
-1.59% error
Ground clearance
-5.6 mm
ride height delta
Sidewall change
-31.0 mm
revs/km: 459.0
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/compare/225-55-r18-vs-265-35-r20Detailed comparison
| Metric | 225/55 R18 | 265/35 R20 | Difference |
|---|---|---|---|
| Overall diameter | 704.7 mm | 693.5 mm | -11.2 mm (-1.59%) |
| Sidewall height | 123.8 mm | 92.8 mm | -31.0 mm |
| Circumference | 2.214 m | 2.179 m | -35.2 mm |
| Revs / km | 451.7 | 459.0 | +7.3 |
| Ground clearance | reference | -5.6 mm | -5.6 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 98.4 km/h | -1.59 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 98.4 km/h after switching to 265/35 R20 — a -1.59% 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 -5.6 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
225/55 R18
Back to
265/35 R20
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