Comparison
225/50 R17 vs 245/35 R18
Going from 225/50 R17 to 245/35 R18 steps up to a 18-inch rim while trimming sidewall to stay near OEM rolling diameter. This swap noticeably changes overall diameter compared to OEM. The speedometer error is noticeable and may warrant a recalibration if you rely on indicated speed. Expect a more planted steering feel, at the cost of some of the cushioning a taller sidewall provides. Diameter delta falls in the cautious 3–5% range, where speedometer recalibration and a careful clearance check are worth doing.
TakeA solid pick for drivers chasing a more aggressive stance without abandoning OEM rolling diameter.
Quick math: 245/35 R18 is 28.1 mm shorter than 225/50 R17, shifting the speedometer by -4.28%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
-28.1 mm
-4.28%
Speedometer at 100
95.7 km/h
-4.28% error
Ground clearance
-14.0 mm
ride height delta
Sidewall change
-26.8 mm
revs/km: 506.3
Permalink for this comparison:
/compare/225-50-r17-vs-245-35-r18Detailed comparison
| Metric | 225/50 R17 | 245/35 R18 | Difference |
|---|---|---|---|
| Overall diameter | 656.8 mm | 628.7 mm | -28.1 mm (-4.28%) |
| Sidewall height | 112.5 mm | 85.8 mm | -26.8 mm |
| Circumference | 2.063 m | 1.975 m | -88.3 mm |
| Revs / km | 484.6 | 506.3 | +21.7 |
| Ground clearance | reference | -14.0 mm | -14.0 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 95.7 km/h | -4.28 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 95.7 km/h after switching to 245/35 R18 — a -4.28% 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 -14.0 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
225/50 R17
Back to
245/35 R18
Drivers also compare
Closely-related fitments and plus-size swaps for 225/50 R17 and 245/35 R18.
215/40 R18 vs 245/35 R18
Wider variation on the same rim — more grip, less clearance.
Δ 0.08%
225/50 R17 vs 245/45 R17
Wider variation on the same rim — more grip, less clearance.
Δ 0.69%
245/35 R18 vs 255/35 R18
Wider variation on the same rim — more grip, less clearance.
Δ 1.11%
225/40 R18 vs 245/35 R18
Wider variation on the same rim — more grip, less clearance.
Δ 1.33%
215/50 R17 vs 225/50 R17
Wider variation on the same rim — more grip, less clearance.
Δ 1.55%
215/55 R17 vs 225/50 R17
Wider variation on the same rim — more grip, less clearance.
Δ 1.72%
225/50 R17 vs 235/45 R17
Wider variation on the same rim — more grip, less clearance.
Δ 2.06%
235/40 R18 vs 245/35 R18
Wider variation on the same rim — more grip, less clearance.
Δ 2.56%
Related topics