275/30R21 vs 275/40R19
275/40R19 is 5.0 mm taller than 275/30R21 in overall diameter (+0.7%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 275/40R19 fitted, the speedometer reads 100 km/h when you are doing 100.7 km/h.
Dimensions side by side
| 275/30R21 | 275/40R19 | |
|---|---|---|
| Overall diameter | 698 mm (27.5″) | 703 mm (27.7″) |
| Section width | 275 mm | 275 mm |
| Sidewall height | 83 mm | 110 mm |
| Rim | 21″ | 19″ |
| Revolutions per km | 456 | 453 |
| In stock | 3 tires from $539.00 | 24 tires from $158.00 |
What changes
- Overall diameter: 275/40R19 is 5.0 mm taller (+0.7%).
- Speedometer: reads 100 km/h at an actual 100.7 km/h with 275/40R19.
- Wheel size changes from 21″ to 19″: 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 275/30R21
Vehicles that use 275/40R19
See every alternate size for 275/30R21
Frequently asked questions
Can I use 275/40R19 instead of 275/30R21?
Usually, yes: 275/40R19 is within 3% of the overall diameter of 275/30R21 (+0.7%). 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 275/30R21 and 275/40R19?
With 275/40R19 instead of 275/30R21, the speedometer shows 100 km/h when you are actually doing 100.7 km/h.
Which vehicles came with both 275/30R21 and 275/40R19?
Both sizes were original equipment, on different trims or packages, on the 2024 Mercedes-Benz E350, 2024 Mercedes-Benz E450, 2009–2022 BMW 750i, 2017 BMW 740i, 2017 BMW M760i, 2011–2015 BMW 740Li.