Comparison
255/55 R18 vs 265/60 R18
265/60 R18 is a wider variation of 255/55 R18 on the same 18-inch rim, adding 10 mm of tread footprint. This wheel and tire pairing noticeably changes overall diameter compared to OEM. The dashboard speed will be significantly off — plan on recalibration before daily use. The taller sidewall adds cushioning over potholes and rougher roads, with a softer overall ride. The diameter gap exceeds 5%, which can affect speedometer accuracy, ABS calibration and final gearing — review with a professional first.
TakeTreat as a serious modification — verify clearance, recalibrate the speedometer and reassess load capacity.
Quick math: 265/60 R18 is 37.5 mm taller than 255/55 R18, shifting the speedometer by +5.08%.
Current Tire
New Tire
Ground line · scaled comparison
Not Recommended
Over 5% — speedometer & ABS may misread
Diameter change
+37.5 mm
5.08%
Speedometer at 100
105.1 km/h
+5.08% error
Ground clearance
+18.8 mm
ride height delta
Sidewall change
+18.8 mm
revs/km: 410.6
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/compare/255-55-r18-vs-265-60-r18Detailed comparison
| Metric | 255/55 R18 | 265/60 R18 | Difference |
|---|---|---|---|
| Overall diameter | 737.7 mm | 775.2 mm | +37.5 mm (+5.08%) |
| Sidewall height | 140.3 mm | 159.0 mm | +18.8 mm |
| Circumference | 2.318 m | 2.435 m | +117.8 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 | +5.08 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 +5.08% 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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255/55 R18
Back to
265/60 R18
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