Comparison
255/50 R19 vs 265/60 R18
Minus-sizing from 255/50 R19 to 265/60 R18 pairs a smaller 18-inch wheel with more rubber between the rim and road. This sizing approach swings rolling diameter far enough to feel on the road. Speedometer error is large enough that recalibration is effectively required for accurate readings. Extra sidewall absorbs impacts more readily — a sensible bias for daily commuting and broken pavement. The diameter gap exceeds 5%, which can affect speedometer accuracy, ABS calibration and final gearing — review with a professional first.
TakeRecommended only after a professional fitment check and speedometer recalibration.
Quick math: 265/60 R18 is 37.6 mm taller than 255/50 R19, shifting the speedometer by +5.10%.
Current Tire
New Tire
Ground line · scaled comparison
Not Recommended
Over 5% — speedometer & ABS may misread
Diameter change
+37.6 mm
5.10%
Speedometer at 100
105.1 km/h
+5.10% error
Ground clearance
+18.8 mm
ride height delta
Sidewall change
+31.5 mm
revs/km: 410.6
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/compare/255-50-r19-vs-265-60-r18Detailed comparison
| Metric | 255/50 R19 | 265/60 R18 | Difference |
|---|---|---|---|
| Overall diameter | 737.6 mm | 775.2 mm | +37.6 mm (+5.10%) |
| Sidewall height | 127.5 mm | 159.0 mm | +31.5 mm |
| Circumference | 2.317 m | 2.435 m | +118.1 mm |
| Revs / km | 431.5 | 410.6 | -20.9 |
| Ground clearance | reference | +18.8 mm | +18.8 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 105.1 km/h | +5.10 km/h |
Verdict: danger
Over 5% diameter difference — likely to affect speedometer accuracy, ABS calibration and gearing. Not recommended without professional review.
Speedometer impact
At a true 100 km/h, your dashboard will read 105.1 km/h after switching to 265/60 R18 — a +5.10% 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 +18.8 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.
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255/50 R19
Back to
265/60 R18
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