Comparison
235/35 R19 vs 245/40 R17
Switching from 235/35 R19 to 245/40 R17 steps down to a 17-inch wheel — a familiar move for winter and dedicated all-terrain sets. This sizing approach moves rolling diameter a touch off the original spec. Expect a slight but noticeable shift in indicated speed compared to the original tires. The taller sidewall adds cushioning over potholes and rougher roads, with a softer overall ride. Overall the swap sits inside the safe ±3% diameter window, so ABS, traction control and gearing behave normally.
TakeTypical choice for a dedicated winter or off-road setup where extra sidewall pays off.
Quick math: 245/40 R17 is 19.3 mm shorter than 235/35 R19, shifting the speedometer by -2.98%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-19.3 mm
-2.98%
Speedometer at 100
97.0 km/h
-2.98% error
Ground clearance
-9.6 mm
ride height delta
Sidewall change
+15.8 mm
revs/km: 507.0
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/compare/235-35-r19-vs-245-40-r17Detailed comparison
| Metric | 235/35 R19 | 245/40 R17 | Difference |
|---|---|---|---|
| Overall diameter | 647.1 mm | 627.8 mm | -19.3 mm (-2.98%) |
| Sidewall height | 82.3 mm | 98.0 mm | +15.8 mm |
| Circumference | 2.033 m | 1.972 m | -60.6 mm |
| Revs / km | 491.9 | 507.0 | +15.1 |
| Ground clearance | reference | -9.6 mm | -9.6 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 97.0 km/h | -2.98 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 97.0 km/h after switching to 245/40 R17 — a -2.98% 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 -9.6 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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245/40 R17
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