Comparison
245/45 R18 vs 255/35 R19
Plus-sizing from 245/45 R18 to 255/35 R19 keeps overall diameter close to factory while opening room for a larger 19-inch wheel. This sizing approach shifts overall diameter slightly from OEM.
Expect a slight but noticeable shift in indicated speed compared to the original tires. The shorter sidewall gives the tire a firmer, more responsive feel and sharpens steering input. More tread on the ground tends to improve dry grip and stance, with a small fuel-economy and clearance tradeoff. Many drivers pick this direction primarily for appearance — the bigger rim simply looks more aggressive. Diameter change stays inside the conservative ±3% safety window — an OEM-safe fitment on most vehicles.
TakeCommon upgrade for sportier handling and a tighter wheel-gap look on the same vehicle.
Quick math: 255/35 R19 is 16.6 mm shorter than 245/45 R18, shifting the speedometer by -2.45%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-16.6 mm
-2.45%
Speedometer at 100
97.6 km/h
-2.45% error
Ground clearance
-8.3 mm
ride height delta
Sidewall change
-21.0 mm
revs/km: 481.5
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/compare/245-45-r18-vs-255-35-r19Detailed comparison
| Metric | 245/45 R18 | 255/35 R19 | Difference |
|---|---|---|---|
| Overall diameter | 677.7 mm | 661.1 mm | -16.6 mm (-2.45%) |
| Sidewall height | 110.3 mm | 89.3 mm | -21.0 mm |
| Circumference | 2.129 m | 2.077 m | -52.2 mm |
| Revs / km | 469.7 | 481.5 | +11.8 |
| Ground clearance | reference | -8.3 mm | -8.3 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 97.6 km/h | -2.45 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 97.6 km/h after switching to 255/35 R19 — a -2.45% 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 -8.3 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
245/45 R18
Back to
255/35 R19
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