Comparison
225/65 R17 vs 245/60 R18
Going from 225/65 R17 to 245/60 R18 steps up to a 18-inch rim while trimming sidewall to stay near OEM rolling diameter. This setup noticeably changes overall diameter compared to OEM. The shorter sidewall gives the tire a firmer, more responsive feel and sharpens steering input.
The speedometer error is noticeable and may warrant a recalibration if you rely on indicated speed. Diameter delta falls in the cautious 3–5% range, where speedometer recalibration and a careful clearance check are worth doing.
TakeA solid pick for drivers chasing a more aggressive stance without abandoning OEM rolling diameter.
Quick math: 245/60 R18 is 26.9 mm taller than 225/65 R17, shifting the speedometer by +3.71%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
+26.9 mm
3.71%
Speedometer at 100
103.7 km/h
+3.71% error
Ground clearance
+13.5 mm
ride height delta
Sidewall change
+0.8 mm
revs/km: 423.7
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/compare/225-65-r17-vs-245-60-r18Detailed comparison
| Metric | 225/65 R17 | 245/60 R18 | Difference |
|---|---|---|---|
| Overall diameter | 724.3 mm | 751.2 mm | +26.9 mm (+3.71%) |
| Sidewall height | 146.3 mm | 147.0 mm | +0.8 mm |
| Circumference | 2.275 m | 2.360 m | +84.5 mm |
| Revs / km | 439.5 | 423.7 | -15.7 |
| Ground clearance | reference | +13.5 mm | +13.5 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 103.7 km/h | +3.71 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 103.7 km/h after switching to 245/60 R18 — a +3.71% 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 +13.5 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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225/65 R17
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245/60 R18
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