It will only fit if your wheels are 21-inch and the rim width is approved for 245/40 R21. Start by checking the tyre size printed on your current sidewall and confirm the manufacturer-recommended sizes on your door placard or handbook. If you are changing from a different size, keep overall rolling diameter as close as possible to avoid speedometer and clearance issues.
Match the load index and speed rating listed on your vehicle placard or handbook, then select the same or higher rating when buying. This size is often available with higher ratings suitable for heavier vehicles or high-speed motorway driving, but the correct choice depends on your exact model and axle limits. If you are unsure, use your current tyre sidewall markings as a reliable reference before ordering.
Many vehicles running 245/40 R21 specify XL because the combination of a larger wheel and lower sidewall often requires higher load capacity. If your placard or existing tyre shows XL, choose XL again to keep the correct maximum load rating. If it does not, do not upgrade or downgrade without checking the vehicle specification, as load requirements and recommended pressures can differ.
Yes, several manufacturers produce runflat versions in 245/40 R21, usually marked with identifiers such as RFT, ROF or SSR depending on the brand. Only choose runflats if your vehicle and wheels are compatible and you are comfortable with the ride characteristics of low-profile runflats. If switching away from runflats, ensure you have an alternative mobility solution such as a tyre inflation kit and that your TPMS is functioning correctly.
For mostly mild conditions with frequent rain, all-season tyres in 245/40 R21 can be a strong year-round option, especially if you want to avoid seasonal changeovers. If you regularly drive in temperatures below 7C or face snow and ice, winter tyres with the 3PMSF marking will improve cold-weather traction and braking. If you prioritise warm-weather handling and braking, summer tyres are the best match, and whichever type you choose, fit the same tyre type across an axle for consistent grip and stability.
