245 is the tyre width in millimetres, 40 is the sidewall height as a percentage of the width, R means radial construction, and 19 is the wheel diameter in inches. When buying, also match the correct load index and speed rating listed on your current tyre or vehicle placard.
Use the exact load index and speed rating shown on the door jamb sticker, handbook, or your existing tyres, and do not go below the vehicle manufacturer specification. Popular markings in 245/40 R19 include higher speed ratings such as W or Y, but the right choice depends on your car’s approved fitment and axle loads.
Yes, many 245/40 R19 options are offered as XL (extra load) for heavier saloons and performance models, and some are available as runflat depending on brand. If your car was supplied with runflats, sticking with the same type helps maintain the intended ride and handling, while switching to non-runflat should only be done if your manufacturer and mobility plan support it.
A common pairing is 275/35 R19 on the rear, with some vehicles using alternatives such as 285/35 R19 depending on wheel width and body clearance. Always confirm the approved front and rear sizes for your exact model and trim, as mismatched rolling circumference can affect stability systems and drivetrain components.
In most cases, yes - 245/40 R19 is typically well suited to an 8.5J rim and is often used on 8.0J to 9.5J wheels depending on the tyre model. Check your wheel’s stamped width, then confirm the tyre’s approved rim range and your vehicle’s clearance to avoid rubbing on full lock or under load.
