Comparison
225/50 R18 vs 265/35 R20
Plus-sizing from 225/50 R18 to 265/35 R20 keeps overall diameter close to factory while opening room for a larger 20-inch wheel. This wheel and tire pairing shifts overall diameter slightly from OEM. Expect a slight but noticeable shift in indicated speed compared to the original tires. Less sidewall flex usually translates to crisper turn-in and a slightly stiffer ride over rough pavement. Diameter change stays inside the conservative ±3% safety window — an OEM-safe fitment on most vehicles.
TakeA solid pick for drivers chasing a more aggressive stance without abandoning OEM rolling diameter.
Quick math: 265/35 R20 is 11.3 mm taller than 225/50 R18, shifting the speedometer by +1.66%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
+11.3 mm
1.66%
Speedometer at 100
101.7 km/h
+1.66% error
Ground clearance
+5.6 mm
ride height delta
Sidewall change
-19.8 mm
revs/km: 459.0
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/compare/225-50-r18-vs-265-35-r20Detailed comparison
| Metric | 225/50 R18 | 265/35 R20 | Difference |
|---|---|---|---|
| Overall diameter | 682.2 mm | 693.5 mm | +11.3 mm (+1.66%) |
| Sidewall height | 112.5 mm | 92.8 mm | -19.8 mm |
| Circumference | 2.143 m | 2.179 m | +35.5 mm |
| Revs / km | 466.6 | 459.0 | -7.6 |
| Ground clearance | reference | +5.6 mm | +5.6 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 101.7 km/h | +1.66 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 101.7 km/h after switching to 265/35 R20 — a +1.66% 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
225/50 R18
Back to
265/35 R20
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