245/40R18 vs 275/30R19
275/30R19 is 5.0 mm shorter than 245/40R18 in overall diameter (−0.8%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 275/30R19 fitted, the speedometer reads 100 km/h when you are doing 99.2 km/h.
Dimensions side by side
| 245/40R18 | 275/30R19 | |
|---|---|---|
| Overall diameter | 653 mm (25.7″) | 648 mm (25.5″) |
| Section width | 245 mm | 275 mm |
| Sidewall height | 98 mm | 83 mm |
| Rim | 18″ | 19″ |
| Revolutions per km | 487 | 491 |
| In stock | 62 tires from $119.00 | 5 tires from $275.00 |
What changes
- Overall diameter: 275/30R19 is 5.0 mm shorter (−0.8%).
- Speedometer: reads 100 km/h at an actual 99.2 km/h with 275/30R19.
- 275/30R19 is 30 mm wider, so check clearance and the recommended rim width.
- Wheel size changes from 18″ 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 245/40R18
Vehicles that use 275/30R19
See every alternate size for 245/40R18
Frequently asked questions
Can I use 275/30R19 instead of 245/40R18?
Usually, yes: 275/30R19 is within 3% of the overall diameter of 245/40R18 (−0.8%). 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 245/40R18 and 275/30R19?
With 275/30R19 instead of 245/40R18, the speedometer shows 100 km/h when you are actually doing 99.2 km/h.
Which vehicles came with both 245/40R18 and 275/30R19?
Both sizes were original equipment, on different trims or packages, on the 2015–2016 Mercedes-Benz E250, 2016 Mercedes-Benz E350, 2016 Mercedes-Benz E400, 2007–2008 Jaguar S-Type, 2004–2006 Mercedes-Benz E55.