Comparison
235/60 R16 vs 245/45 R18
Going from 235/60 R16 to 245/45 R18 steps up to a 18-inch rim while trimming sidewall to stay near OEM rolling diameter. This alternative fitment shifts overall diameter slightly from OEM. The speedometer offset is small but measurable; worth keeping in mind if you watch the dash closely. Expect a more planted steering feel, at the cost of some of the cushioning a taller sidewall provides. Diameter change stays inside the conservative ±3% safety window — an OEM-safe fitment on most vehicles.
TakeA solid pick for drivers chasing a more aggressive stance without abandoning OEM rolling diameter.
Quick math: 245/45 R18 is 10.7 mm shorter than 235/60 R16, shifting the speedometer by -1.55%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-10.7 mm
-1.55%
Speedometer at 100
98.4 km/h
-1.55% error
Ground clearance
-5.3 mm
ride height delta
Sidewall change
-30.8 mm
revs/km: 469.7
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/compare/235-60-r16-vs-245-45-r18Detailed comparison
| Metric | 235/60 R16 | 245/45 R18 | Difference |
|---|---|---|---|
| Overall diameter | 688.4 mm | 677.7 mm | -10.7 mm (-1.55%) |
| Sidewall height | 141.0 mm | 110.3 mm | -30.8 mm |
| Circumference | 2.163 m | 2.129 m | -33.6 mm |
| Revs / km | 462.4 | 469.7 | +7.3 |
| Ground clearance | reference | -5.3 mm | -5.3 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 98.4 km/h | -1.55 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 98.4 km/h after switching to 245/45 R18 — a -1.55% 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 -5.3 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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235/60 R16
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245/45 R18
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