Start by checking the size printed on your current tyre sidewall and the vehicle placard (often inside the driver door shut or fuel flap). If both show 255/40 R19, you are in the right place, but also confirm whether your car uses a staggered setup where front and rear sizes differ. If you are unsure, enter your registration details or check your handbook before ordering.
Match the load index and speed rating shown on your existing tyres or the manufacturer specification, and do not go below it. This size is often supplied with higher speed ratings (such as W or Y) and may be marked XL (Extra Load) for heavier or higher-performance models. Selecting the correct rating helps maintain handling, braking performance and insurance compliance.
Many cars that use this size, especially certain BMW trims, may be factory-fitted with runflats. You can switch to standard tyres if your vehicle setup allows it, but plan for puncture support (sealant kit or spare) and expect a change in ride feel. Avoid mixing runflat and non-runflat tyres on the same axle, and for consistent handling it is best to change as a full set or at least in axle pairs.
Choose summer tyres if you prioritise dry and wet performance in milder temperatures, as they are designed to work best above about 7C. Winter tyres are the safest option for regular cold-weather driving, offering better traction and braking in low temperatures, slush and snow. All-season tyres suit drivers who want one set year-round, especially where winters are moderate and convenience matters.
255/40 R19 typically fits a range of 19 inch rim widths, commonly around 8.5J to 10J depending on the tyre model, with many applications using 9J. Check the wheel width stamped inside the wheel or in the vehicle specification, then compare it against the tyre manufacturer’s approved rim range. If your wheels are at the narrow or wide end of the range, choose a tyre model known to fit well on that width.
