245/40R19 vs 275/30R20
275/30R20 is 6.0 mm shorter than 245/40R19 in overall diameter (−0.9%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 275/30R20 fitted, the speedometer reads 100 km/h when you are doing 99.1 km/h.
Dimensions side by side
| 245/40R19 | 275/30R20 | |
|---|---|---|
| Overall diameter | 679 mm (26.7″) | 673 mm (26.5″) |
| Section width | 245 mm | 275 mm |
| Sidewall height | 98 mm | 83 mm |
| Rim | 19″ | 20″ |
| Revolutions per km | 469 | 473 |
| In stock | 56 tires from $125.00 | 14 tires from $269.00 |
What changes
- Overall diameter: 275/30R20 is 6.0 mm shorter (−0.9%).
- Speedometer: reads 100 km/h at an actual 99.1 km/h with 275/30R20.
- 275/30R20 is 30 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 245/40R19
Vehicles that use 275/30R20
See every alternate size for 245/40R19
Frequently asked questions
Can I use 275/30R20 instead of 245/40R19?
Usually, yes: 275/30R20 is within 3% of the overall diameter of 245/40R19 (−0.9%). 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 245/40R19 and 275/30R20?
With 275/30R20 instead of 245/40R19, the speedometer shows 100 km/h when you are actually doing 99.1 km/h.
Which vehicles came with both 245/40R19 and 275/30R20?
Both sizes were original equipment, on different trims or packages, on the 2020–2024 BMW 840i, 2019–2024 BMW M850i, 2024 Mercedes-Benz CLE300, 2024 Mercedes-Benz CLE450, 2019–2023 Mercedes-Benz E53, 2019–2023 Mercedes-Benz CLS450.