Comparison
215/55 R17 vs 255/40 R19
Switching from 215/55 R17 to 255/40 R19 is a plus-2 upgrade that wraps a shorter sidewall around a larger 19-inch wheel. This sizing approach trims or stretches rolling diameter by a small margin. Less sidewall flex usually translates to crisper turn-in and a slightly stiffer ride over rough pavement.
Expect a slight but noticeable shift in indicated speed compared to the original tires. Overall the swap sits inside the safe ±3% diameter window, so ABS, traction control and gearing behave normally.
TakeCommon upgrade for sportier handling and a tighter wheel-gap look on the same vehicle.
Quick math: 255/40 R19 is 18.3 mm taller than 215/55 R17, shifting the speedometer by +2.74%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
+18.3 mm
2.74%
Speedometer at 100
102.7 km/h
+2.74% error
Ground clearance
+9.1 mm
ride height delta
Sidewall change
-16.3 mm
revs/km: 463.6
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/compare/215-55-r17-vs-255-40-r19Detailed comparison
| Metric | 215/55 R17 | 255/40 R19 | Difference |
|---|---|---|---|
| Overall diameter | 668.3 mm | 686.6 mm | +18.3 mm (+2.74%) |
| Sidewall height | 118.3 mm | 102.0 mm | -16.3 mm |
| Circumference | 2.100 m | 2.157 m | +57.5 mm |
| Revs / km | 476.3 | 463.6 | -12.7 |
| Ground clearance | reference | +9.1 mm | +9.1 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 102.7 km/h | +2.74 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 102.7 km/h after switching to 255/40 R19 — a +2.74% 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
215/55 R17
Back to
255/40 R19
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