Comparison
235/35 R19 vs 255/40 R17
Minus-sizing from 235/35 R19 to 255/40 R17 pairs a smaller 17-inch wheel with more rubber between the rim and road. This tire combination shifts overall diameter slightly from OEM. The speedometer offset is small but measurable; worth keeping in mind if you watch the dash closely. Extra sidewall absorbs impacts more readily — a sensible bias for daily commuting and broken pavement. Diameter change stays inside the conservative ±3% safety window — an OEM-safe fitment on most vehicles.
TakePractical direction for winter wheels, chains, or rougher pavement where cushioning matters.
Quick math: 255/40 R17 is 11.3 mm shorter than 235/35 R19, shifting the speedometer by -1.75%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-11.3 mm
-1.75%
Speedometer at 100
98.3 km/h
-1.75% error
Ground clearance
-5.6 mm
ride height delta
Sidewall change
+19.8 mm
revs/km: 500.6
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/compare/235-35-r19-vs-255-40-r17Detailed comparison
| Metric | 235/35 R19 | 255/40 R17 | Difference |
|---|---|---|---|
| Overall diameter | 647.1 mm | 635.8 mm | -11.3 mm (-1.75%) |
| Sidewall height | 82.3 mm | 102.0 mm | +19.8 mm |
| Circumference | 2.033 m | 1.997 m | -35.5 mm |
| Revs / km | 491.9 | 500.6 | +8.7 |
| Ground clearance | reference | -5.6 mm | -5.6 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 98.3 km/h | -1.75 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 98.3 km/h after switching to 255/40 R17 — a -1.75% 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 -5.6 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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255/40 R17
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