Comparison
225/35 R19 vs 245/35 R18
Switching from 225/35 R19 to 245/35 R18 steps down to a 18-inch wheel — a familiar move for winter and dedicated all-terrain sets. This sizing approach trims or stretches rolling diameter by a small margin. The speedometer offset is small but measurable; worth keeping in mind if you watch the dash closely. More tread on the ground tends to improve dry grip and stance, with a small fuel-economy and clearance tradeoff. Overall the swap sits inside the safe ±3% diameter window, so ABS, traction control and gearing behave normally.
TakeTypical choice for a dedicated winter or off-road setup where extra sidewall pays off.
Quick math: 245/35 R18 is 11.4 mm shorter than 225/35 R19, shifting the speedometer by -1.78%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-11.4 mm
-1.78%
Speedometer at 100
98.2 km/h
-1.78% error
Ground clearance
-5.7 mm
ride height delta
Sidewall change
+7.0 mm
revs/km: 506.3
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/compare/225-35-r19-vs-245-35-r18Detailed comparison
| Metric | 225/35 R19 | 245/35 R18 | Difference |
|---|---|---|---|
| Overall diameter | 640.1 mm | 628.7 mm | -11.4 mm (-1.78%) |
| Sidewall height | 78.8 mm | 85.8 mm | +7.0 mm |
| Circumference | 2.011 m | 1.975 m | -35.8 mm |
| Revs / km | 497.3 | 506.3 | +9.0 |
| Ground clearance | reference | -5.7 mm | -5.7 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 98.2 km/h | -1.78 km/h |
Verdict: excellent
Within ±3% — speedometer, ABS and traction control should behave normally.
Speedometer impact
At a true 100 km/h, your dashboard will read 98.2 km/h after switching to 245/35 R18 — a -1.78% 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 -5.7 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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225/35 R19
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245/35 R18
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