Comparison
235/55 R18 vs 235/65 R17
235/65 R17 drops the rim from 18 to 17 inches versus 235/55 R18, trading wheel size for taller sidewall. This tire combination noticeably changes overall diameter compared to OEM.
The speedometer error is noticeable and may warrant a recalibration if you rely on indicated speed. The taller sidewall adds cushioning over potholes and rougher roads, with a softer overall ride. The smaller wheel is also lighter and easier to find affordable winter rubber for. Diameter delta falls in the cautious 3–5% range, where speedometer recalibration and a careful clearance check are worth doing.
TakeTypical choice for a dedicated winter or off-road setup where extra sidewall pays off.
Quick math: 235/65 R17 is 21.6 mm taller than 235/55 R18, shifting the speedometer by +3.02%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
+21.6 mm
3.02%
Speedometer at 100
103.0 km/h
+3.02% error
Ground clearance
+10.8 mm
ride height delta
Sidewall change
+23.5 mm
revs/km: 431.7
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/compare/235-55-r18-vs-235-65-r17Detailed comparison
| Metric | 235/55 R18 | 235/65 R17 | Difference |
|---|---|---|---|
| Overall diameter | 715.7 mm | 737.3 mm | +21.6 mm (+3.02%) |
| Sidewall height | 129.3 mm | 152.8 mm | +23.5 mm |
| Circumference | 2.248 m | 2.316 m | +67.9 mm |
| Revs / km | 444.8 | 431.7 | -13.0 |
| Ground clearance | reference | +10.8 mm | +10.8 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 103.0 km/h | +3.02 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 103.0 km/h after switching to 235/65 R17 — a +3.02% 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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235/55 R18
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235/65 R17
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