Comparison
245/35 R19 vs 245/40 R17
Minus-sizing from 245/35 R19 to 245/40 R17 pairs a smaller 17-inch wheel with more rubber between the rim and road. This swap swings rolling diameter far enough to feel on the road. Extra sidewall absorbs impacts more readily — a sensible bias for daily commuting and broken pavement.
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.
TakePractical direction for winter wheels, chains, or rougher pavement where cushioning matters.
Quick math: 245/40 R17 is 26.3 mm shorter than 245/35 R19, shifting the speedometer by -4.02%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
-26.3 mm
-4.02%
Speedometer at 100
96.0 km/h
-4.02% error
Ground clearance
-13.1 mm
ride height delta
Sidewall change
+12.3 mm
revs/km: 507.0
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/compare/245-35-r19-vs-245-40-r17Detailed comparison
| Metric | 245/35 R19 | 245/40 R17 | Difference |
|---|---|---|---|
| Overall diameter | 654.1 mm | 627.8 mm | -26.3 mm (-4.02%) |
| Sidewall height | 85.8 mm | 98.0 mm | +12.3 mm |
| Circumference | 2.055 m | 1.972 m | -82.6 mm |
| Revs / km | 486.6 | 507.0 | +20.4 |
| Ground clearance | reference | -13.1 mm | -13.1 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 96.0 km/h | -4.02 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 96.0 km/h after switching to 245/40 R17 — a -4.02% 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 -13.1 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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245/35 R19
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245/40 R17
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