Comparison
245/35 R19 vs 255/40 R19
On the same 19-inch wheel, 255/40 R19 grows the section width by 10 mm versus 245/35 R19. This wheel and tire pairing moves rolling diameter well outside the usual OEM tolerance.
The speedometer error is noticeable and may warrant a recalibration if you rely on indicated speed. More sidewall typically improves comfort and curb protection, especially on city streets. Extra width broadens the footprint for more grip, but check inner liner and strut clearance before fitting. 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: 255/40 R19 is 32.5 mm taller than 245/35 R19, shifting the speedometer by +4.97%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
+32.5 mm
4.97%
Speedometer at 100
105.0 km/h
+4.97% error
Ground clearance
+16.3 mm
ride height delta
Sidewall change
+16.3 mm
revs/km: 463.6
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/compare/245-35-r19-vs-255-40-r19Detailed comparison
| Metric | 245/35 R19 | 255/40 R19 | Difference |
|---|---|---|---|
| Overall diameter | 654.1 mm | 686.6 mm | +32.5 mm (+4.97%) |
| Sidewall height | 85.8 mm | 102.0 mm | +16.3 mm |
| Circumference | 2.055 m | 2.157 m | +102.1 mm |
| Revs / km | 486.6 | 463.6 | -23.0 |
| Ground clearance | reference | +16.3 mm | +16.3 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 105.0 km/h | +4.97 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 105.0 km/h after switching to 255/40 R19 — a +4.97% 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 +16.3 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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245/35 R19
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255/40 R19
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