Comparison
245/60 R18 vs 265/50 R20
Plus-sizing from 245/60 R18 to 265/50 R20 keeps overall diameter close to factory while opening room for a larger 20-inch wheel. This alternative fitment trims or stretches rolling diameter by a small margin. Less sidewall flex usually translates to crisper turn-in and a slightly stiffer ride over rough pavement.
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.
TakeA solid pick for drivers chasing a more aggressive stance without abandoning OEM rolling diameter.
Quick math: 265/50 R20 is 21.8 mm taller than 245/60 R18, shifting the speedometer by +2.90%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
+21.8 mm
2.90%
Speedometer at 100
102.9 km/h
+2.90% error
Ground clearance
+10.9 mm
ride height delta
Sidewall change
-14.5 mm
revs/km: 411.8
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/compare/245-60-r18-vs-265-50-r20Detailed comparison
| Metric | 245/60 R18 | 265/50 R20 | Difference |
|---|---|---|---|
| Overall diameter | 751.2 mm | 773.0 mm | +21.8 mm (+2.90%) |
| Sidewall height | 147.0 mm | 132.5 mm | -14.5 mm |
| Circumference | 2.360 m | 2.428 m | +68.5 mm |
| Revs / km | 423.7 | 411.8 | -12.0 |
| Ground clearance | reference | +10.9 mm | +10.9 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 102.9 km/h | +2.90 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 102.9 km/h after switching to 265/50 R20 — a +2.90% 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 +10.9 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
245/60 R18
Back to
265/50 R20
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