255/50R19 vs 275/40R20
275/40R20 is 10.0 mm shorter than 255/50R19 in overall diameter (−1.4%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 275/40R20 fitted, the speedometer reads 100 km/h when you are doing 98.6 km/h.
Dimensions side by side
| 255/50R19 | 275/40R20 | |
|---|---|---|
| Overall diameter | 738 mm (29.1″) | 728 mm (28.7″) |
| Section width | 255 mm | 275 mm |
| Sidewall height | 128 mm | 110 mm |
| Rim | 19″ | 20″ |
| Revolutions per km | 431 | 437 |
| In stock | 56 tires from $160.00 | 39 tires from $143.00 |
What changes
- Overall diameter: 275/40R20 is 10.0 mm shorter (−1.4%).
- Speedometer: reads 100 km/h at an actual 98.6 km/h with 275/40R20.
- 275/40R20 is 20 mm wider, so check clearance and the recommended rim width.
- Wheel size changes from 19″ to 20″: 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 255/50R19
Vehicles that use 275/40R20
See every alternate size for 255/50R19
Frequently asked questions
Can I use 275/40R20 instead of 255/50R19?
Usually, yes: 275/40R20 is within 3% of the overall diameter of 255/50R19 (−1.4%). 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 255/50R19 and 275/40R20?
With 275/40R20 instead of 255/50R19, the speedometer shows 100 km/h when you are actually doing 98.6 km/h.
Which vehicles came with both 255/50R19 and 275/40R20?
Both sizes were original equipment, on different trims or packages, on the 2008–2019 BMW X6, 2005–2006, 2011–2018 BMW X5, 2006–2013 Land Rover Range Rover Sport, 2003–2006 Porsche Cayenne.