Comparison
245/40 R18 vs 275/35 R19
Going from 245/40 R18 to 275/35 R19 steps up to a 19-inch rim while trimming sidewall to stay near OEM rolling diameter. This setup noticeably changes overall diameter compared to OEM. Expect a more planted steering feel, at the cost of some of the cushioning a taller sidewall provides.
Indicated speed will drift far enough that recalibration is worth considering. The 3–5% diameter gap puts this in caution territory: doable on many cars, but verify clearance and consider recalibration.
TakeA solid pick for drivers chasing a more aggressive stance without abandoning OEM rolling diameter.
Quick math: 275/35 R19 is 21.9 mm taller than 245/40 R18, shifting the speedometer by +3.35%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
+21.9 mm
3.35%
Speedometer at 100
103.4 km/h
+3.35% error
Ground clearance
+10.9 mm
ride height delta
Sidewall change
-1.8 mm
revs/km: 471.5
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/compare/245-40-r18-vs-275-35-r19Detailed comparison
| Metric | 245/40 R18 | 275/35 R19 | Difference |
|---|---|---|---|
| Overall diameter | 653.2 mm | 675.1 mm | +21.9 mm (+3.35%) |
| Sidewall height | 98.0 mm | 96.3 mm | -1.8 mm |
| Circumference | 2.052 m | 2.121 m | +68.8 mm |
| Revs / km | 487.3 | 471.5 | -15.8 |
| Ground clearance | reference | +10.9 mm | +10.9 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 103.4 km/h | +3.35 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 103.4 km/h after switching to 275/35 R19 — a +3.35% 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 +10.9 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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245/40 R18
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275/35 R19
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