255/45R22 vs 255/50R21
255/50R21 is 0.0 mm taller than 255/45R22 in overall diameter (±0.0%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 255/50R21 fitted, the speedometer reads 100 km/h when you are doing 100.0 km/h.
Dimensions side by side
| 255/45R22 | 255/50R21 | |
|---|---|---|
| Overall diameter | 788 mm (31.0″) | 788 mm (31.0″) |
| Section width | 255 mm | 255 mm |
| Sidewall height | 115 mm | 128 mm |
| Rim | 22″ | 21″ |
| Revolutions per km | 404 | 404 |
| In stock | 1 tire from $488.00 | 2 tires from $544.00 |
What changes
- Overall diameter: 255/50R21 is 0.0 mm taller (±0.0%).
- Speedometer: reads 100 km/h at an actual 100.0 km/h with 255/50R21.
- Wheel size changes from 22″ to 21″: 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 255/45R22
Vehicles that use 255/50R21
See every alternate size for 255/45R22
Frequently asked questions
Can I use 255/50R21 instead of 255/45R22?
Usually, yes: 255/50R21 is within 3% of the overall diameter of 255/45R22 (±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 255/45R22 and 255/50R21?
With 255/50R21 instead of 255/45R22, the speedometer shows 100 km/h when you are actually doing 100.0 km/h.
Which vehicles came with both 255/45R22 and 255/50R21?
Both sizes were original equipment, on different trims or packages, on the 2018–2024 Rolls Royce Phantom, 2020–2024 Rolls Royce Cullinan, 2024 Lincoln Nautilus.