Comparison
215/45 R18 vs 245/40 R19
Switching from 215/45 R18 to 245/40 R19 is a plus-1 upgrade that wraps a shorter sidewall around a larger 19-inch wheel. This swap swings rolling diameter far enough to feel on the road. The speedometer error is noticeable and may warrant a recalibration if you rely on indicated speed. Expect a more planted steering feel, at the cost of some of the cushioning a taller sidewall provides. The 3–5% diameter gap puts this in caution territory: doable on many cars, but verify clearance and consider recalibration.
TakeCommon upgrade for sportier handling and a tighter wheel-gap look on the same vehicle.
Quick math: 245/40 R19 is 27.9 mm taller than 215/45 R18, shifting the speedometer by +4.29%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
+27.9 mm
4.29%
Speedometer at 100
104.3 km/h
+4.29% error
Ground clearance
+13.9 mm
ride height delta
Sidewall change
+1.3 mm
revs/km: 469.1
Permalink for this comparison:
/compare/215-45-r18-vs-245-40-r19Detailed comparison
| Metric | 215/45 R18 | 245/40 R19 | Difference |
|---|---|---|---|
| Overall diameter | 650.7 mm | 678.6 mm | +27.9 mm (+4.29%) |
| Sidewall height | 96.8 mm | 98.0 mm | +1.3 mm |
| Circumference | 2.044 m | 2.132 m | +87.7 mm |
| Revs / km | 489.2 | 469.1 | -20.1 |
| Ground clearance | reference | +13.9 mm | +13.9 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 104.3 km/h | +4.29 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 104.3 km/h after switching to 245/40 R19 — a +4.29% 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 +13.9 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.
Back to
215/45 R18
Back to
245/40 R19
Drivers also compare
Closely-related fitments and plus-size swaps for 215/45 R18 and 245/40 R19.
215/45 R18 vs 275/35 R18
Wider variation on the same rim — more grip, less clearance.
Δ 0.15%
215/45 R18 vs 245/40 R18
Wider variation on the same rim — more grip, less clearance.
Δ 0.38%
245/40 R19 vs 275/35 R19
Wider variation on the same rim — more grip, less clearance.
Δ 0.52%
245/40 R19 vs 285/35 R19
Wider variation on the same rim — more grip, less clearance.
Δ 0.52%
215/45 R18 vs 235/40 R18
Wider variation on the same rim — more grip, less clearance.
Δ 0.85%
225/45 R19 vs 245/40 R19
Wider variation on the same rim — more grip, less clearance.
Δ 0.95%
245/40 R19 vs 255/40 R19
Wider variation on the same rim — more grip, less clearance.
Δ 1.18%
235/40 R19 vs 245/40 R19
Wider variation on the same rim — more grip, less clearance.
Δ 1.19%
Related topics