Comparison
245/60 R18 vs 265/60 R18
265/60 R18 is a wider variation of 245/60 R18 on the same 18-inch rim, adding 20 mm of tread footprint. This alternative fitment moves rolling diameter well outside the usual OEM tolerance.
The speedometer error is noticeable and may warrant a recalibration if you rely on indicated speed. The wider section adds contact patch and lateral stability, while eating into fender and suspension clearance. The 3–5% diameter gap puts this in caution territory: doable on many cars, but verify clearance and consider recalibration.
TakeUseful when extra dry grip and stance matter more than a small fuel-economy hit.
Quick math: 265/60 R18 is 24.0 mm taller than 245/60 R18, shifting the speedometer by +3.19%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
+24.0 mm
3.19%
Speedometer at 100
103.2 km/h
+3.19% error
Ground clearance
+12.0 mm
ride height delta
Sidewall change
+12.0 mm
revs/km: 410.6
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/compare/245-60-r18-vs-265-60-r18Detailed comparison
| Metric | 245/60 R18 | 265/60 R18 | Difference |
|---|---|---|---|
| Overall diameter | 751.2 mm | 775.2 mm | +24.0 mm (+3.19%) |
| Sidewall height | 147.0 mm | 159.0 mm | +12.0 mm |
| Circumference | 2.360 m | 2.435 m | +75.4 mm |
| Revs / km | 423.7 | 410.6 | -13.1 |
| Ground clearance | reference | +12.0 mm | +12.0 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 103.2 km/h | +3.19 km/h |
Verdict: warning
Between 3% and 5% — noticeable speedometer drift; recalibration may be advisable.
Speedometer impact
At a true 100 km/h, your dashboard will read 103.2 km/h after switching to 265/60 R18 — a +3.19% 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 +12.0 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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245/60 R18
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265/60 R18
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