255/45R22 vs 285/40R22
285/40R22 is 1.0 mm shorter than 255/45R22 in overall diameter (−0.1%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 285/40R22 fitted, the speedometer reads 100 km/h when you are doing 99.9 km/h.
Dimensions side by side
| 255/45R22 | 285/40R22 | |
|---|---|---|
| Overall diameter | 788 mm (31.0″) | 787 mm (31.0″) |
| Section width | 255 mm | 285 mm |
| Sidewall height | 115 mm | 114 mm |
| Rim | 22″ | 22″ |
| Revolutions per km | 404 | 404 |
| In stock | 1 tire from $488.00 | 18 tires from $399.00 |
What changes
- Overall diameter: 285/40R22 is 1.0 mm shorter (−0.1%).
- Speedometer: reads 100 km/h at an actual 99.9 km/h with 285/40R22.
- 285/40R22 is 30 mm wider, so check clearance and the recommended rim width.
- Choose a load index at least as high as the one on your door placard.
Vehicles that came with both sizes
Vehicles that use 255/45R22
Vehicles that use 285/40R22
See every alternate size for 255/45R22
Frequently asked questions
Can I use 285/40R22 instead of 255/45R22?
Usually, yes: 285/40R22 is within 3% of the overall diameter of 255/45R22 (−0.1%). 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 255/45R22 and 285/40R22?
With 285/40R22 instead of 255/45R22, the speedometer shows 100 km/h when you are actually doing 99.9 km/h.
Which vehicles came with both 255/45R22 and 285/40R22?
Both sizes were original equipment, on different trims or packages, on the 2018–2024 Rolls Royce Phantom, 2020–2024 Rolls Royce Cullinan, 2024 Rolls Royce Spectre.