Comparison
245/35 R19 vs 255/35 R18
Switching from 245/35 R19 to 255/35 R18 steps down to a 18-inch wheel — a familiar move for winter and dedicated all-terrain sets. This sizing approach shifts overall diameter slightly from OEM. Expect a slight but noticeable shift in indicated speed compared to the original tires. Extra width broadens the footprint for more grip, but check inner liner and strut clearance before fitting. Diameter change stays inside the conservative ±3% safety window — an OEM-safe fitment on most vehicles.
TakeTypical choice for a dedicated winter or off-road setup where extra sidewall pays off.
Quick math: 255/35 R18 is 18.4 mm shorter than 245/35 R19, shifting the speedometer by -2.81%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-18.4 mm
-2.81%
Speedometer at 100
97.2 km/h
-2.81% error
Ground clearance
-9.2 mm
ride height delta
Sidewall change
+3.5 mm
revs/km: 500.7
Permalink for this comparison:
/compare/245-35-r19-vs-255-35-r18Detailed comparison
| Metric | 245/35 R19 | 255/35 R18 | Difference |
|---|---|---|---|
| Overall diameter | 654.1 mm | 635.7 mm | -18.4 mm (-2.81%) |
| Sidewall height | 85.8 mm | 89.3 mm | +3.5 mm |
| Circumference | 2.055 m | 1.997 m | -57.8 mm |
| Revs / km | 486.6 | 500.7 | +14.1 |
| Ground clearance | reference | -9.2 mm | -9.2 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 97.2 km/h | -2.81 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 97.2 km/h after switching to 255/35 R18 — a -2.81% 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 -9.2 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
245/35 R19
Back to
255/35 R18
Drivers also compare
Closely-related fitments and plus-size swaps for 245/35 R19 and 255/35 R18.
225/40 R18 vs 255/35 R18
Wider variation on the same rim — more grip, less clearance.
Δ 0.24%
215/40 R18 vs 255/35 R18
Wider variation on the same rim — more grip, less clearance.
Δ 1.03%
245/35 R19 vs 255/35 R19
Wider variation on the same rim — more grip, less clearance.
Δ 1.07%
235/35 R19 vs 245/35 R19
Wider variation on the same rim — more grip, less clearance.
Δ 1.08%
245/35 R18 vs 255/35 R18
Wider variation on the same rim — more grip, less clearance.
Δ 1.11%
225/40 R19 vs 245/35 R19
Wider variation on the same rim — more grip, less clearance.
Δ 1.28%
235/40 R18 vs 255/35 R18
Wider variation on the same rim — more grip, less clearance.
Δ 1.47%
245/35 R19 vs 265/35 R19
Wider variation on the same rim — more grip, less clearance.
Δ 2.14%
Related topics