255/50R20 vs 265/45R21
265/45R21 is 9.0 mm taller than 255/50R20 in overall diameter (+1.2%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 265/45R21 fitted, the speedometer reads 100 km/h when you are doing 101.2 km/h.
Dimensions side by side
| 255/50R20 | 265/45R21 | |
|---|---|---|
| Overall diameter | 763 mm (30.0″) | 772 mm (30.4″) |
| Section width | 255 mm | 265 mm |
| Sidewall height | 128 mm | 119 mm |
| Rim | 20″ | 21″ |
| Revolutions per km | 417 | 412 |
| In stock | 50 tires from $169.00 | 22 tires from $195.00 |
What changes
- Overall diameter: 265/45R21 is 9.0 mm taller (+1.2%).
- Speedometer: reads 100 km/h at an actual 101.2 km/h with 265/45R21.
- 265/45R21 is 10 mm wider, so check clearance and the recommended rim width.
- Wheel size changes from 20″ 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 255/50R20
Vehicles that use 265/45R21
See every alternate size for 255/50R20
Frequently asked questions
Can I use 265/45R21 instead of 255/50R20?
Usually, yes: 265/45R21 is within 3% of the overall diameter of 255/50R20 (+1.2%). 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 255/50R20 and 265/45R21?
With 265/45R21 instead of 255/50R20, the speedometer shows 100 km/h when you are actually doing 101.2 km/h.
Which vehicles came with both 255/50R20 and 265/45R21?
Both sizes were original equipment, on different trims or packages, on the 2018–2024 Land Rover Range Rover Velar, 2021–2024 Jaguar F-Pace, 2024 Audi Q8 e-tron, 2019–2023 Audi e-tron.