Comparison
235/55 R19 vs 245/60 R18
Going from 235/55 R19 to 245/60 R18 is a minus-1 setup that adds sidewall on a smaller 18-inch wheel. This tire combination preserves rolling diameter within a hair of the original.
Speedometer drift stays small enough that most drivers won't notice it day to day. More sidewall typically improves comfort and curb protection, especially on city streets. The wider section adds contact patch and lateral stability, while eating into fender and suspension clearance. Minus-sizing keeps replacement costs down and opens up a wider range of winter and all-terrain tires. Diameter change stays inside the conservative ±3% safety window — an OEM-safe fitment on most vehicles.
TakePractical direction for winter wheels, chains, or rougher pavement where cushioning matters.
Quick math: 245/60 R18 is 10.1 mm taller than 235/55 R19, shifting the speedometer by +1.36%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
+10.1 mm
1.36%
Speedometer at 100
101.4 km/h
+1.36% error
Ground clearance
+5.1 mm
ride height delta
Sidewall change
+17.8 mm
revs/km: 423.7
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/compare/235-55-r19-vs-245-60-r18Detailed comparison
| Metric | 235/55 R19 | 245/60 R18 | Difference |
|---|---|---|---|
| Overall diameter | 741.1 mm | 751.2 mm | +10.1 mm (+1.36%) |
| Sidewall height | 129.3 mm | 147.0 mm | +17.8 mm |
| Circumference | 2.328 m | 2.360 m | +31.7 mm |
| Revs / km | 429.5 | 423.7 | -5.8 |
| Ground clearance | reference | +5.1 mm | +5.1 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 101.4 km/h | +1.36 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 101.4 km/h after switching to 245/60 R18 — a +1.36% 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 +5.1 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 R19
Back to
245/60 R18
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