Comparison
215/50 R17 vs 255/40 R17
Going from 215/50 R17 to 255/40 R17 keeps the rim but tightens the sidewall for a sportier look. This wheel and tire pairing moves rolling diameter a touch off the original spec. The shorter sidewall gives the tire a firmer, more responsive feel and sharpens steering input.
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.
TakeSuits drivers who value sharper steering and appearance over outright ride softness.
Quick math: 255/40 R17 is 11.0 mm shorter than 215/50 R17, shifting the speedometer by -1.70%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-11.0 mm
-1.70%
Speedometer at 100
98.3 km/h
-1.70% error
Ground clearance
-5.5 mm
ride height delta
Sidewall change
-5.5 mm
revs/km: 500.6
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/compare/215-50-r17-vs-255-40-r17Detailed comparison
| Metric | 215/50 R17 | 255/40 R17 | Difference |
|---|---|---|---|
| Overall diameter | 646.8 mm | 635.8 mm | -11.0 mm (-1.70%) |
| Sidewall height | 107.5 mm | 102.0 mm | -5.5 mm |
| Circumference | 2.032 m | 1.997 m | -34.6 mm |
| Revs / km | 492.1 | 500.6 | +8.5 |
| Ground clearance | reference | -5.5 mm | -5.5 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 98.3 km/h | -1.70 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 -1.70% 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 -5.5 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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215/50 R17
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255/40 R17
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