Comparison
245/35 R19 vs 255/40 R17
255/40 R17 drops the rim from 19 to 17 inches versus 245/35 R19, trading wheel size for taller sidewall. This setup moves rolling diameter a touch off the original spec. The speedometer offset is small but measurable; worth keeping in mind if you watch the dash closely. More sidewall typically improves comfort and curb protection, especially on city streets. Diameter change stays inside the conservative ±3% safety window — an OEM-safe fitment on most vehicles.
TakeTypical choice for a dedicated winter or off-road setup where extra sidewall pays off.
Quick math: 255/40 R17 is 18.3 mm shorter than 245/35 R19, shifting the speedometer by -2.80%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-18.3 mm
-2.80%
Speedometer at 100
97.2 km/h
-2.80% error
Ground clearance
-9.1 mm
ride height delta
Sidewall change
+16.3 mm
revs/km: 500.6
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/compare/245-35-r19-vs-255-40-r17Detailed comparison
| Metric | 245/35 R19 | 255/40 R17 | Difference |
|---|---|---|---|
| Overall diameter | 654.1 mm | 635.8 mm | -18.3 mm (-2.80%) |
| Sidewall height | 85.8 mm | 102.0 mm | +16.3 mm |
| Circumference | 2.055 m | 1.997 m | -57.5 mm |
| Revs / km | 486.6 | 500.6 | +14.0 |
| Ground clearance | reference | -9.1 mm | -9.1 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 97.2 km/h | -2.80 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 97.2 km/h after switching to 255/40 R17 — a -2.80% 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 -9.1 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.
Back to
245/35 R19
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255/40 R17
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