Comparison
215/65 R16 vs 245/45 R18
Going from 215/65 R16 to 245/45 R18 steps up to a 18-inch rim while trimming sidewall to stay near OEM rolling diameter. This tire combination preserves rolling diameter within a hair of the original. Expect a more planted steering feel, at the cost of some of the cushioning a taller sidewall provides.
The speedometer offset is mild and well inside what most cars can tolerate without recalibration. 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 8.2 mm shorter than 215/65 R16, shifting the speedometer by -1.20%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-8.2 mm
-1.20%
Speedometer at 100
98.8 km/h
-1.20% error
Ground clearance
-4.1 mm
ride height delta
Sidewall change
-29.5 mm
revs/km: 469.7
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/compare/215-65-r16-vs-245-45-r18Detailed comparison
| Metric | 215/65 R16 | 245/45 R18 | Difference |
|---|---|---|---|
| Overall diameter | 685.9 mm | 677.7 mm | -8.2 mm (-1.20%) |
| Sidewall height | 139.8 mm | 110.3 mm | -29.5 mm |
| Circumference | 2.155 m | 2.129 m | -25.8 mm |
| Revs / km | 464.1 | 469.7 | +5.6 |
| Ground clearance | reference | -4.1 mm | -4.1 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 98.8 km/h | -1.20 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 98.8 km/h after switching to 245/45 R18 — a -1.20% 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 -4.1 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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215/65 R16
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245/45 R18
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