Comparison
215/60 R17 vs 245/45 R18
245/45 R18 is a plus-1 alternative to 215/60 R17 — the bigger wheel shows through a thinner sidewall. This swap shifts overall diameter slightly from OEM. The speedometer offset is small but measurable; worth keeping in mind if you watch the dash closely. The shorter sidewall gives the tire a firmer, more responsive feel and sharpens steering input. Overall the swap sits inside the safe ±3% diameter window, so ABS, traction control and gearing behave normally.
TakeA solid pick for drivers chasing a more aggressive stance without abandoning OEM rolling diameter.
Quick math: 245/45 R18 is 12.1 mm shorter than 215/60 R17, shifting the speedometer by -1.75%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-12.1 mm
-1.75%
Speedometer at 100
98.2 km/h
-1.75% error
Ground clearance
-6.0 mm
ride height delta
Sidewall change
-18.8 mm
revs/km: 469.7
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/compare/215-60-r17-vs-245-45-r18Detailed comparison
| Metric | 215/60 R17 | 245/45 R18 | Difference |
|---|---|---|---|
| Overall diameter | 689.8 mm | 677.7 mm | -12.1 mm (-1.75%) |
| Sidewall height | 129.0 mm | 110.3 mm | -18.8 mm |
| Circumference | 2.167 m | 2.129 m | -38.0 mm |
| Revs / km | 461.5 | 469.7 | +8.2 |
| Ground clearance | reference | -6.0 mm | -6.0 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 98.2 km/h | -1.75 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 98.2 km/h after switching to 245/45 R18 — a -1.75% 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 -6.0 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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215/60 R17
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245/45 R18
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