Comparison
235/35 R19 vs 245/40 R19
Stepping from 235/35 R19 to 245/40 R19 keeps the 19-inch wheel but widens the section by 10 mm. This tire combination swings rolling diameter far enough to feel on the road. The taller sidewall adds cushioning over potholes and rougher roads, with a softer overall ride.
The speedometer error is noticeable and may warrant a recalibration if you rely on indicated speed. The 3–5% diameter gap puts this in caution territory: doable on many cars, but verify clearance and consider recalibration.
TakeReasonable performance-leaning swap as long as fender and suspension clearance check out.
Quick math: 245/40 R19 is 31.5 mm taller than 235/35 R19, shifting the speedometer by +4.87%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
+31.5 mm
4.87%
Speedometer at 100
104.9 km/h
+4.87% error
Ground clearance
+15.8 mm
ride height delta
Sidewall change
+15.8 mm
revs/km: 469.1
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/compare/235-35-r19-vs-245-40-r19Detailed comparison
| Metric | 235/35 R19 | 245/40 R19 | Difference |
|---|---|---|---|
| Overall diameter | 647.1 mm | 678.6 mm | +31.5 mm (+4.87%) |
| Sidewall height | 82.3 mm | 98.0 mm | +15.8 mm |
| Circumference | 2.033 m | 2.132 m | +99.0 mm |
| Revs / km | 491.9 | 469.1 | -22.8 |
| Ground clearance | reference | +15.8 mm | +15.8 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 104.9 km/h | +4.87 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 104.9 km/h after switching to 245/40 R19 — a +4.87% 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 +15.8 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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235/35 R19
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245/40 R19
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