Comparison
225/55 R17 vs 245/45 R17
245/45 R17 is a lower-profile take on 225/55 R17 — same 17-inch wheel, shorter sidewall. This swap swings rolling diameter far enough to feel on the road. The shorter sidewall gives the tire a firmer, more responsive feel and sharpens steering input.
The speedometer error is noticeable and may warrant a recalibration if you rely on indicated speed. The 3–5% diameter gap puts this in caution territory: doable on many cars, but verify clearance and consider recalibration.
TakeSuits drivers who value sharper steering and appearance over outright ride softness.
Quick math: 245/45 R17 is 27.0 mm shorter than 225/55 R17, shifting the speedometer by -3.97%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
-27.0 mm
-3.97%
Speedometer at 100
96.0 km/h
-3.97% error
Ground clearance
-13.5 mm
ride height delta
Sidewall change
-13.5 mm
revs/km: 488.0
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/compare/225-55-r17-vs-245-45-r17Detailed comparison
| Metric | 225/55 R17 | 245/45 R17 | Difference |
|---|---|---|---|
| Overall diameter | 679.3 mm | 652.3 mm | -27.0 mm (-3.97%) |
| Sidewall height | 123.8 mm | 110.3 mm | -13.5 mm |
| Circumference | 2.134 m | 2.049 m | -84.8 mm |
| Revs / km | 468.6 | 488.0 | +19.4 |
| Ground clearance | reference | -13.5 mm | -13.5 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 96.0 km/h | -3.97 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 96.0 km/h after switching to 245/45 R17 — a -3.97% 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 -13.5 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.
Back to
225/55 R17
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245/45 R17
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