It means the tyre is 295 mm wide, has a 30% profile (a short sidewall), is radial construction (R), and fits a 21-inch wheel. The low profile is designed for responsive handling but makes correct fitment and the right load rating especially important.
It must match both your wheel diameter (21-inch) and the approved rim width range for the specific tyre model. Many 295/30 R21 tyres suit wider rims (often around 10.5J), so confirm your wheel width and check your vehicle handbook or door placard before ordering.
Match the load index on your current tyres or the vehicle placard, as this size is frequently used on heavier, high-power cars that require higher load ratings, often with XL construction. Avoid selecting a lower load index, especially if it is a rear fitment on a staggered setup.
Many options come with high speed ratings such as Y or (Y), designed for performance vehicles. Choose the same or higher speed rating than your manufacturer specifies, and keep the rating consistent across the axle for predictable handling.
It is possible, but it is usually better to replace tyres in pairs on the same axle so tread depth and grip stay balanced. If your car is AWD or has traction-sensitive systems, check the manufacturer guidance first, as mismatched rolling circumference can affect stability and driveline components.
