Comparison
225/45 R19 vs 245/40 R19
Stepping from 225/45 R19 to 245/40 R19 keeps the 19-inch wheel but widens the section by 20 mm. This alternative fitment barely shifts the rolling circumference. Less sidewall flex usually translates to crisper turn-in and a slightly stiffer ride over rough pavement.
Speedometer drift stays small enough that most drivers won't notice it day to day. Diameter change stays inside the conservative ±3% safety window — an OEM-safe fitment on most vehicles.
TakeReasonable performance-leaning swap as long as fender and suspension clearance check out.
Quick math: 245/40 R19 is 6.5 mm shorter than 225/45 R19, shifting the speedometer by -0.95%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-6.5 mm
-0.95%
Speedometer at 100
99.1 km/h
-0.95% error
Ground clearance
-3.3 mm
ride height delta
Sidewall change
-3.3 mm
revs/km: 469.1
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/compare/225-45-r19-vs-245-40-r19Detailed comparison
| Metric | 225/45 R19 | 245/40 R19 | Difference |
|---|---|---|---|
| Overall diameter | 685.1 mm | 678.6 mm | -6.5 mm (-0.95%) |
| Sidewall height | 101.3 mm | 98.0 mm | -3.3 mm |
| Circumference | 2.152 m | 2.132 m | -20.4 mm |
| Revs / km | 464.6 | 469.1 | +4.5 |
| Ground clearance | reference | -3.3 mm | -3.3 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 99.1 km/h | -0.95 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 99.1 km/h after switching to 245/40 R19 — a -0.95% 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 -3.3 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.
Back to
225/45 R19
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245/40 R19
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