Comparison
215/50 R17 vs 215/55 R17
215/55 R17 is a taller-sidewall alternative to 215/50 R17 on the same 17-inch rim. This swap moves rolling diameter well outside the usual OEM tolerance.
The speedometer error is noticeable and may warrant a recalibration if you rely on indicated speed. More sidewall typically improves comfort and curb protection, especially on city streets. Diameter delta falls in the cautious 3–5% range, where speedometer recalibration and a careful clearance check are worth doing.
TakeA comfort-leaning direction that's easier on wheels and suspension over rough surfaces.
Quick math: 215/55 R17 is 21.5 mm taller than 215/50 R17, shifting the speedometer by +3.32%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
+21.5 mm
3.32%
Speedometer at 100
103.3 km/h
+3.32% error
Ground clearance
+10.8 mm
ride height delta
Sidewall change
+10.8 mm
revs/km: 476.3
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/compare/215-50-r17-vs-215-55-r17Detailed comparison
| Metric | 215/50 R17 | 215/55 R17 | Difference |
|---|---|---|---|
| Overall diameter | 646.8 mm | 668.3 mm | +21.5 mm (+3.32%) |
| Sidewall height | 107.5 mm | 118.3 mm | +10.8 mm |
| Circumference | 2.032 m | 2.100 m | +67.5 mm |
| Revs / km | 492.1 | 476.3 | -15.8 |
| Ground clearance | reference | +10.8 mm | +10.8 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 103.3 km/h | +3.32 km/h |
Verdict: warning
Between 3% and 5% — noticeable speedometer drift; recalibration may be advisable.
Speedometer impact
At a true 100 km/h, your dashboard will read 103.3 km/h after switching to 215/55 R17 — a +3.32% 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 +10.8 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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215/55 R17
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