255/40R20 vs 255/45R19
255/45R19 is 0.0 mm taller than 255/40R20 in overall diameter (±0.0%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 255/45R19 fitted, the speedometer reads 100 km/h when you are doing 100.0 km/h.
Dimensions side by side
| 255/40R20 | 255/45R19 | |
|---|---|---|
| Overall diameter | 712 mm (28.0″) | 712 mm (28.0″) |
| Section width | 255 mm | 255 mm |
| Sidewall height | 102 mm | 115 mm |
| Rim | 20″ | 19″ |
| Revolutions per km | 447 | 447 |
| In stock | 47 tires from $164.00 | 54 tires from $150.00 |
What changes
- Overall diameter: 255/45R19 is 0.0 mm taller (±0.0%).
- Speedometer: reads 100 km/h at an actual 100.0 km/h with 255/45R19.
- Wheel size changes from 20″ to 19″: you need wheels in the new size.
- Choose a load index at least as high as the one on your door placard.
Vehicles that came with both sizes
Vehicles that use 255/40R20
Vehicles that use 255/45R19
See every alternate size for 255/40R20
Frequently asked questions
Can I use 255/45R19 instead of 255/40R20?
Usually, yes: 255/45R19 is within 3% of the overall diameter of 255/40R20 (±0.0%). Use wheels of the right size and width, match or exceed the original load index, and check clearance at full steering lock.
How much does the speedometer change between 255/40R20 and 255/45R19?
With 255/45R19 instead of 255/40R20, the speedometer shows 100 km/h when you are actually doing 100.0 km/h.
Which vehicles came with both 255/40R20 and 255/45R19?
Both sizes were original equipment, on different trims or packages, on the 2020–2024 Tesla Model Y, 2021–2024 Volvo XC40, 2022–2024 Audi Q3, 2022–2024 Mercedes-Benz S500, 2022–2024 Mercedes-Benz S580, 2022–2024 Volvo C40.